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Input: Sen. Bob Corker  is tripling down on  his  criticism of President Trump as a leader  telling ABC News today that  he  believes the "utterly untruthful" commander in chief is "debasing" the United States.
"I don't think there's any question that that's the case  just in the way  he  conducts  himself  and goes to such a low level. I just â I do " Corker  R-Tenn.  said of Trump in an interview on Capitol Hill.
 Corker  added  "The worst of it is going to be the whole debasing of our nation. I think that will be the contribution that hurts our nation most."
After the two engaged in a war of words this morning   Corker  said Trump wasn't being truthful.Asked whether he considered the president a liar   Corker  said  they  don't use that "word in  our  family" but reiterated Trump is "utterly untruthful.""You would think he would try to focus on things where there wasn't a witness  but the whole world is a witness to these untruths "  Corker  said.As for whether he regrets supporting Trump during the campaign and the early days of his administration   Corker  smiled and asked  "What do you think?""There were many people. I was one of those that hoped he would rise to the occasion as president and aspire to lead our nation instead of dividing it "  Corker  said  adding  "[Trump] hasn't risen to the occasion."Corker earlier this morning stood by his Oct. 8 remarks criticizing the White House as an "adult day care center" and arguing that Trump is putting the United States on a path toward "World War III.""I don't make comments I haven't thought about  " Corker  said Tuesday on " Good Morning America ."His remarks on "GMA" triggered a Twitter exchange after Trump responded that  Corker   who's not running for re-election  "couldn't get elected dog catcher " and  Corker  then called Trump "an utterly untruthful president."
 Bob Corker   who helped President O give us the bad Iran Deal & couldn't get elected dog catcher in Tennessee  is now fighting Tax Cuts.... â Donald J. Trump (@realDonaldTrump) October 24  2017
... Corker  dropped out of the race in Tennesse when I refused to endorse him  and now is only negative on anything Trump. Look at his record! â Donald J. Trump (@realDonaldTrump) October 24  2017
 Corker 's office denied that he asked for Trump's endorsement  instead saying that Trump urged  Corker  to run for re-election.
The senator was an early Trump ally  endorsing him during the presidential campaign. But  Corker  has since been wary of how Trump is handling the presidency â in particular   his  treatment of Secretary of State Rex Tillerson.
"When you look at the fact that we've got this issue in North Korea and the president continues to kneecap his diplomatic representative  the secretary of state  and really move him away from successful diplomatic negotiations with China  which is key to this  you're taking us on a path to combat  " Corker  said on "Good Morning America" today.
 He  added that when it comes to the diplomatic efforts underway to handle the rising tensions with North Korea   he  would like for Trump to "leave it to the professionals for a while."
"The president undermines our secretary of state [and] raises tensions in the area by virtue of the tweets that he sends out  " Corker  said.
Another negotiation  Corker  wants Trump to stay out of is the tax debate.
With Trump planning to travel to Capitol Hill today to pitch his tax overhaul to Senate Republicans during their policy lunch   Corker  told "Good Morning America " "What I hope is going to happen is the president will leave this effort  if you will  to the tax-writing committees  let them do their work and not begin taking things off the table that ought to be debated in these committees at the proper time."
Asked whether he buys the administration's argument that economic growth under its tax plan will cut the deficit by a trillion dollars   Corker  remained hesitant  " We 'll have to see. Obviously   we  need to look at scoring mechanisms and go through the process."
As the chairman of the Senate Committee on Foreign Relations   Corker  also weighed in this morning on the Oct. 4 ambush in Niger. The Pentagon has opened an investigation into the attack amid questions about how the mission went awry led to the deaths of four U.S. service members.
"Those details we don't know  but we do know in that general area there are a lot of people that wish us harm  " Corker  said.

Trump an 'utterly untruthful' president who's 'debasing' the US GOP Sen. Bob Corker says