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 (CNN) A top adviser to Donald Trump resigned Monday after sending a mocking tweet about just-fired campaign manager Corey Lewandowski, a campaign source tells CNN. 
 
 Michael Caputo, a Trump adviser and head of the communications for Trump's caucus operations team, tweeted "Ding Dong the witch is dead" following the news that Lewandowski had been fired. 
 
 "I regret sending out a tweet today alluding to the firing of Corey Lewandowski. In hindsight, that was too exuberant a reaction to this personnel move. I know this is a distraction from the kind of campaign you want to run, so I'm resigning my position as director of communications for caucus operations at the 2016 Republican National Convention. Let's make this immediate," Caputo wrote in a letter to campaign chairman Paul Manafort and Rick Gates, according to a copy obtained by CNN. 
 
 Caputo also said he deeply respects Trump as well as Manafort and Gates. 
 
 "I wish you success in the months ahead. I continue to believe Donald Trump must be elected President in November. With you at the helm, I know he can. Call if I can help," he said. 
 
 Caputo later told CNN that "falling on the sword is what you do if you mess up." 
 
 "Unforced errors have no place on a general election campaign for the White House," he said. 
 
 Cleveland 
 
 Caputo had been quietly helping to build Trump's convention's caucus operations team ahead of Cleveland, and was serving as communications director for caucus operations. 
 
 The campaign was scheduled to release its caucus operations team on Tuesday, according to a convention source. 
 
 The team, part of campaign chairman Paul Manafort's convention operation, will serve as a liaison between Trump's campaign and the national convention staff and has been meeting with RNC staff on the ground in Cleveland for the last two and a half weeks -- marking a big step toward creating a more traditional political machine for a campaign built on nonconformity. 
 
 Veterans 
 
 Trump's team is heavily comprised of military veterans, including its director of caucus operations, Ryan Price, who served as an Army Ranger. Price is a longtime GOP campaign operative, and former director of operation for the 2012 Republican National Convention in Tampa. 
 
 Price will be assisted by David Urban, a West Point grad and Army Gulf War veteran who had worked as chief of staff for former Pennsylvania Sen. Arlen Specter. Urban will serve as deputy director. Caputo was to serve as director of communications for caucus operations at the 2016 Republican convention. 
 
 John Ullyot, a Marine veteran and former adviser to former Sens. John Warner and Specter, who was to serve as deputy director of communications for media relations, will now serve as head of communications due to Caputo's departure. 
 
 According to one convention source, the 14-person team will not be involved in any of the campaign's day-to-day communications operations. That will still fall to Trump's spokeswoman -- and only campaign communications team staffer -- Hope Hicks. 
 
 Frustrations 
 
 Caputo's departure comes amid frustrations over the campaign's lack of hiring so far of a traditional communications team to handle the high volume of media requests that comes with being a nominee for president, according to two sources in and around the campaign. 
 
 Trump's convention team is currently in the process of trying to refine Trump's message -- building out its surrogate team ahead of Cleveland under John Wagner, the deputy director of communications for surrogate media. One convention source said they have already added 100 new surrogates, a number that will increase to 250 by the time of the convention. 
 
 Wagner has a long list of credentials as retired U.S. Army public affairs officer where he served as an analyst for CENTCOM, an operations officer for NORTHCOM and a media official in Baghdad during Operation Iraqi Freedom. 
 
 'Murder boards' 
 
 Wagner, in conjunction with a new rapid-response team, has been prepping daily to respond to attacks -- sitting through "murder boards," committees set up to drill individuals before hitting the media circuit, according to a convention source. 
 
 Amber Smith, former spokeswoman for Concerned Veterans of America, has been brought on as press secretary of the rapid response team. Smith is a former Kiowa pilot who served in Iraq and Afghanistan. 
 
 Former Trump surrogate and "Apprentice" contestant, Erin Elmore, had been tapped as deputy press secretary, but on Monday, a statement by the Republican National Convention said: "Erin Elmore, who was recently named as a valued deputy press secretary for caucus operations, has left the team and remains active as one of the campaign's surrogate media spokespeople." 
 
 Elmore said Monday she could be a "more effective advocate for Donald Trump's election as as surrogate on TV rather than working behind the scenes in Cleveland. 
 
 Maricelly Velez, will serve the critical role of deputy press secretary for Hispanic media. 
 
 Velez will be responsible for Hispanic outreach during the convention, a position that several sources in and around the campaign say is vital for building unity given various remarks made by Trump during the campaign, including calling Mexican immigrants "rapists" and saying the Mexican-American judge in his Trump University case was incapable of doing his job due to his heritage. Velez had served as assistant director for Hispanic affairs for New York Gov. George Pataki. 

 ADVANCE FOR USE MONDAY, JUNE 20, 2016 AND THEREAFTER -FILE - In this Monday, April 18, 2016 file photo, Democratic presidential candidate Hillary Clinton, center, waves to the crowd during a Women for... (Associated Press) 
 
 ADVANCE FOR USE MONDAY, JUNE 20, 2016 AND THEREAFTER -FILE - In this Monday, April 18, 2016 file photo, Democratic presidential candidate Hillary Clinton, center, waves to the crowd during a Women for Hillary event in New York. (AP Photo/Seth Wenig) (Associated Press) 
 
 WASHINGTON (AP) — The Latest on Campaign 2016. All times EDT: 
 
 5:19 p.m. 
 
 Donald Trump's troubled campaign has lost its second high-level staffer of the day. 
 
 Michael Caputo, who was poised to serve as director of communications for the campaign at the GOP convention, resigned after firing off a celebratory tweet following word of Corey Lewandowski's firing. 
 
 He tweeted, "Ding dong the witch is dead!" after news of Lewandowski's firing broke. Accompanying the tweet was a photo from the "Wizard of Oz," showing the feet of the Wicked Witch of the East protruding from under a house. 
 
 Campaign spokeswoman Hope Hicks confirmed Caputo is no longer with the campaign. 
 
 Caputo had served as the campaign's state director for the New York primary and as a senior adviser. 
 
 ___ 
 
 4:04 p.m. 
 
 A new economic analysis finds that Donald Trump's economic plans would produce a lengthy recession and millions of job losses. 
 
 The study by Moody's Analytics, an economic research service, predicts there would be 3.5 million fewer jobs and unemployment rate as high as 7 percent at the end of Trump's four-year term — if all of his stated policies become law. 
 
 The rate is currently below 5 percent. 
 
 Trump's plans would "diminish the nation's growth prospects," according to the report released Monday. 
 
 Mark Zandi, the lead author of the report, was an economic adviser to Republican Sen. John McCain's presidential campaign. He also was a big defender of President Barack Obama's stimulus package. 
 
 Moody's also is expected to release an analysis of Democrat Hillary Clinton's economic policies. 
 
 ___ 
 
 2:35 p.m. 
 
 Corey Lewandowski, freshly fired from Donald Trump's presidential campaign, is throwing shade at one of the billionaire's key advisers. 
 
 Michael Caputo, a veteran New York Republican operative who has been advising the campaign, on Monday tweeted a photo from the "Wizard of Oz" showing the Wicked Witch of the East's feet sticking out from under a house. "Ding dong the witch is dead!" Caputo tweeted after Lewandowski's firing. 
 
 Lewandowski says Caputo is, "not a senior adviser," and that "I really don't know what he does for the campaign." 
 
 Caputo is focused on shifting the campaign to the convention, where Trump is poised to be formally nominated next month in Cleveland. 
 
 ___ 
 
 2:13 p.m. 
 
 Corey Lewandowski says he had, "a nice conversation with Mr. Trump" while the presumptive GOP presidential candidate was firing him. 
 
 Trump's campaign manager until Monday morning said he told Trump it had been "a privilege" to work for the campaign. 
 
 Lewandowski said he plans to go to the Republican National Convention as the chairman of the New Hampshire delegation. 
 
 In the interview on CNN, Lewandowski relentlessly painted his firing as not the product of anything unpleasant. He said his relationships with Trump, chief adviser Paul Manafort, the candidate's daughter, Ivanka, were good. 
 
 People close to Trump, including adult children Ivanka, Eric and Donald Jr., had long-simmering concerns about Lewandowski, who had limited national experience before becoming Trump's campaign chief. Some of Trump's children were among those urging the billionaire businessman to change tactics for the general election. 
 
 ____ 
 
 2:04 p.m. 
 
 Former Donald Trump campaign manager Corey Lewandowski says he has no regrets about his tumultuous year managing Donald Trump's campaign. 
 
 In an interview with CNN, Lewandowski said the infighting and turmoil that has marked the campaign stemmed in part from his demands for "perfection." 
 
 He says, "That's what Mr. Trump deserves," and that if unnamed people weren't working as hard as Trump, that upset Lewandowski. 
 
 He says, "I'm a very straight shooter, much to my detriment," on many occasions. 
 
 Asked his biggest regret of the campaign, he replied, None, professionally." 
 
 ____ 
 
 1:56 p.m. 
 
 Donald Trump's former campaign manager says he doesn't know why he was fired. 
 
 But Corey Lewandowski, who's been with the campaign since its beginning and was dismissed Monday, said he remains a supporter of the brash billionaire. 
 
 He tells CNN "I don't know the answer to that," when asked if he knows why he was fired. 
 
 Lewandowski also says his relationships with Trump's top adviser, Paul Manafort, and the candidate's daughter, Ivanka are good. 
 
 Lewandowski was fired Monday after a tumultuous period for the campaign, marked by infighting and rumors. Spokeswoman Hope Hicks said in a statement earlier in the day that she wishes Lewandowski the best. 
 
 He is the chairman of the New Hampshire Republican Party's delegation to the GOP national convention. 
 
 ___ 
 
 11:57 a.m. 
 
 Hillary Clinton and a super political action committee backing her have added several million dollars in recent days to their summer advertising plans, which now amount to nearly $48 million through the week of July 19. 
 
 Clinton's Democratic presidential campaign and the super PAC, Priorities USA, are targeting television viewers in battleground states such as Ohio, Florida, North Carolina, Colorado and Nevada, according to advertising tracker Kantar Media's CMAG. 
 
 Meanwhile, Trump has no campaign ads booked in the coming weeks. A super PAC organized by his friend, Los Angeles real estate investor Tom Barrack, is running about $1.2 million worth of ads that attack Clinton as the "same old" type of politician. That group, Rebuilding America Now, is airing its commercials on national cable channels. 
 
 Unlike candidates, super PACs can accept unlimited amounts from donors, although those groups are not allowed to coordinate their ad strategy with the campaign. 
 
 ___ 
 
 11:13 a.m. 
 
 New Hampshire Republican Party officials say Corey Lewandowski remains chairman of the state's convention delegates, despite his departure from Donald Trump's campaign Monday. 
 
 A spokeswoman for the presumptive GOP presidential nominee said in a statement that Lewandowski was no longer with the campaign. 
 
 That raised questions about whether Lewandowski would continue in his role leading New Hampshire's 23 delegates to the convention in Cleveland. Of those, 11 are Trump delegates, all chosen by him. 
 
 Lewandowski was elected chair by his fellow delegates in May, a position he will continue to hold unless he resigns. A state party spokesman says Monday, "at this point the delegation remains unchanged." 
 
 ___ 
 
 10:08 a.m. 
 
 Donald Trump's campaign manager, Corey Lewandowski, is leaving the campaign, following a tumultuous stretch marked by missteps and infighting. 
 
 Trump spokeswoman Hope Hicks says "Lewandowski will no longer be working with the campaign." She says the campaign is grateful for his "hard work and dedication" and wishes him the best. 
 
 Lewandowski has been by Trump's side since the beginning of his unlikely rise to presumptive GOP nominee. 
 
 The move comes as Trump faces continued deep resistance from many quarters of his party concerned by his contentious statements.
– Donald Trump's campaign lost yet another top man Monday—Michael Caputo, who had just celebrated the firing of the campaign's manager with a mocking tweet, the AP reports. "Ding dong the witch is dead!" Caputo tweeted, along with a photo from The Wizard of Oz showing the defeated Wicked Witch of the East, after Corey Lewandowski got fired. But in his letter of resignation to Rick Gates and Paul Manafort, the campaign's chairman, Caputo struck a different tone. "I regret sending out a tweet today alluding to the firing of Corey Lewandowski," he wrote, per CNN. "In hindsight, that was too exuberant a reaction to this personnel move." "I know this is a distraction from the kind of campaign you want to run, so I'm resigning my position as director of communications for caucus operations at the 2016 Republican National Convention. Let's make this immediate." He went on to wish them "success in the months ahead" and said that Trump "must be elected President in November. With you at the helm, I know he can. Call if I can help." (Looks like Trump's adult children were behind Lewandowski's ouster.)