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 / Updated By Alex Seitz-Wald 
 
 Democratic National Committee Chairman Tom Perez has launched a major overhaul of the party's organization, which has been stung by recent crises — and the DNC has requested resignation letters from all current staffers. 
 
 Party staff routinely see major turnover with a new boss and they had been alerted to expect such a move. However, the mass resignation letters will give Perez a chance to completely remake the DNC’s headquarters from scratch. Staffing had already reached unusual lows following a round of post-election layoffs in December. 
 
 Immediately after Perez’s selection as party chairman in late February, an adviser to outgoing DNC Interim Chair Donna Brazile, Leah Daughtry, asked every employee to submit a letter of resignation dated April 15, according to multiple sources familiar with the party’s internal workings. 
 
 A committee advising Perez on his transition is now interviewing staff and others as part of a top-to-bottom review process to decide not only who will stay and who will go, but how the party should be structured in the future. 
 
 Major staffing and organizational changes will be announced in coming weeks, one aide said. 
 
 “This is longstanding precedent at the DNC and has happened during multiple Chair transitions," said DNC spokeswoman Xochitl Hinojosa. "The process was started before the election of the new Chair. From the beginning, Tom has been adamant that we structure the DNC for future campaigns. Current and future DNC staff will be integral to that effort. Over the last few months, the DNC staff has done incredible work under immense pressure to hold Trump accountable.” 
 
 Perez is the party’s third leader in the past year, which was one of its most difficult on record. 
 
 It began with accusations that the DNC favored Hillary Clinton over Bernie Sanders in the Democratic primary, continued with the wrenching exposure of hacked emails and the abrupt resignation of former chair, Rep. Debbie Wasserman Schultz, and concluded with the shocking defeat of its presidential nominee and a divisive race for the new party chairman. 
 
 The grueling experience, which followed years in which many Democrats felt the Obama White House ignored the party organization, has left the DNC with a crisis of confidence and competence. 
 
 Now Perez, who spent most of his career in government and not politics, needs to rebuild the beleaguered party, take on President Donald Trump, tap into a unique moment of progressive activism across the country, and replenish the party's coffers. 
 
 “I wouldn't wish that on anybody,” California Gov. Jerry Brown told Chuck Todd on NBC’s “Meet the Press” on Sunday. “I was the Democratic Party chairman in California — it's a miserable job. So, Tom, too bad.” 
 
 Sanders said Wednesday on MSNBC's "Morning Joe" that the DNC "absolutely" needed to be overhauled. 
 
 "Clearly, the Democratic Party needs a top-down overhaul," Sanders said. "And that top down overhaul means that instead of becoming dependent and being dependent on big money interests for campaign contributions, it has got to become a grassroots party." 
 
 The Vermont lawmaker added the Democratic party "programmaticaly, in terms of how it does business, has failed. I mean the evidence is obvious. It's not just that we've lost the White House and the U.S. Senate and the U.S. House. We've lost 900 legislative seats in the last eight or nine years." 
 
 Perez has spent his first weeks on the job in “active listening mode,” hearing from Democrats in Washington and in small group meetings across the country before making any big moves. 
 
 “What we’re trying to do is culture change,” he told NBC News between stops of a listening tour in Michigan on Friday. “We’re repairing a plane at 20,000 feet. You can’t land the plane, shut it down, and close it until further notice.” 
 
 RELATED: Democratic party boss "thrilled" that Trump failed 
 
 It’s a whirlwind job that took Perez from being feted at a donor conference at the Mandarin Oriental in Washington Thursday night to playing Solitaire on his iPhone in row 31 on a Delta flight to Detroit shortly after dawn the next morning. 
 
 The DNC will embark on a national search to fill key party positions, overseen by the 30-odd members of the transition advisory committee. 
 
 The committee is also reviewing the DNC’s contracts with outside vendors and consultants, a source of complaints from many Democrats. 
 
 Progressives also criticized the transition committee's initial makeup, leading the DNC to add several more members from the left's ranks. 
 
 Earlier this month, Perez held a meeting to discuss the issue with Senate Minority Leader Chuck Schumer and Sanders, both of whom supported Rep. Keith Ellison in the DNC chair race. 
 
 Schumer, pointing to Ellison and Sanders, told Perez, "If he's happy, and if he's happy, then I'm happy,” according to two sources. 
 
 Perez has included Ellison in many of the DNC’s public events so far, but the party’s charter makes no provision for a deputy chair, so Ellison does not have vote on the DNC. That could be fixed by naming the Minnesota congressman to one of the 75 slots the chairman gets to appoint to the national committee. 
 
 Ellison's political director has also been helping to oversee staffing decisions in some key departments in the DNC, according to several sources. 

 The Democratic National Committee (DNC) has asked its staff to submit resignation letters as the party goes through a shakeup after a rough 2016 election cycle. 
 
 Shortly after former Labor Secretary Tom Perez became the party’s chair in late February, the DNC requested resignation letters to be dated April 15, giving Perez the ability — should he choose — to launch a large-scale reorganization. 
 
 Obtaining the resignation letters eases the process for deciding who to keep, regardless of how many are eventually let go. 
 
 In a statement, Perez spokeswoman Xochitl Hinojosa characterized the move as a typical part of any leadership transition. 
 
 "This is longstanding precedent at the DNC and has happened during multiple Chair transitions," Hinojosa said. "The process was started before the election of the new Chair. From the beginning, Tom has been adamant that we structure the DNC for future campaigns. Current and future DNC staff will be integral to that effort. Over the last few months, the DNC staff has done incredible work under immense pressure to hold Trump accountable." 
 
 ADVERTISEMENT NBC News first reported the decision to ask for the resignations, which it said was announced to staff by an aide to Donna Brazile, the outgoing DNC head who served as the party's interim chair during last year's election. 
 
 The DNC faced heavy criticism over the leadership of former Chair Rep. Debbie Wasserman Schultz (D-Fla.), as well as the large role Clinton’s campaign had in running the party last year. 
 
 Earlier this month, Perez announced a transition committee that has been tasked with advising him on all aspects of that transition, including staffing. 
 
 And next month, the party's unity commission will also begin work on recommendations for a slew of party issues, including changes to the nominating process as well as broader questions about how to reorganize the party structure to make it more competitive. 
 
 Updated: 6:20 p.m.
– It's housecleaning time at the Democratic National Committee: The party's governing body has asked all staff members to submit resignation letters dated April 15. Sources tell NBC News that the request was made soon after Tom Perez was elected as the new DNC chief in late February. A transition committee is working on restructuring the party, and while some DNC staffers may stay on, having the resignation letters on hand will smooth the process, the Hill reports. A Perez spokeswoman says the move is a standard part of the process, though it follows an extremely rocky period for the DNC that included the leaking of emails revealing an anti-Bernie Sanders bias—and, months later, the defeat of Hillary Clinton.