Scarborough: Trump so ‘out of it’ he doesn’t know how much he damaged his presidency

MSNBC's Joe Scarborough on Monday said President TrumpDonald John TrumpBusiness school deans call for lifting country-specific visa caps Bolton told ex-Trump aide to call White House lawyers about Ukraine pressure campaign: report Federal prosecutors in New York examining Giuliani business dealings with Ukraine: report MORE doesn't realize how much damage he did to his presidency when he attacked Sen. Bob CorkerRobert (Bob) Phillips CorkerGeorge Conway hits Republicans for not saying Trump's name while criticizing policy Trump announces, endorses ambassador to Japan's Tennessee Senate bid Meet the key Senate player in GOP fight over Saudi Arabia MORE (R-Tenn.).

“This is the thing he doesn’t understand — I mean this, the president is so out of it, he doesn’t understand,” Scarborough said.

“That if you attack Bob Corker, a guy who started a business on his own, became unbelievably successful in his 30s, has always been a success, a mayor, two-term senator."

Corker isn't "scared" of the president, Scarborough said.

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"He’s got nothing to lose. The damage that Donald Trump did additionally to his presidency yesterday is unspeakable," Scarborough said, adding that Trump has lost a vote on tax reform.

"If impeachment does come up, I wouldn't be surprised if Bob Corker and John McCainJohn Sidney McCainThe Hill's 12:30 Report: Video depicting Trump killing media, critics draws backlash Backlash erupts at video depicting Trump killing media, critics Cindy McCain condemns video of fake Trump shooting political opponents, late husband MORE and Susan CollinsSusan Margaret Collins10 top Republicans who continue to deny the undeniable GOP braces for impeachment brawl Furious Republicans prepare to rebuke Trump on Syria MORE and Lisa MurkowskiLisa Ann MurkowskiGOP braces for impeachment brawl Murkowski warns against rushing to conclusions on Trump impeachment GOP requests update on criminal referrals prompted by 2018 Kavanaugh probe MORE and Jeff FlakeJeffrey (Jeff) Lane FlakeHow to survive an impeachment Are Senate Republicans certain that Trump can return to office? Jeff Flake calls Trump's language 'authoritarian' MORE and all of these Republicans that he's going after, if he's, again, not sealing his own fate," he said.

His comments come after Trump feuded with Corker this weekend, taking aim at the Tennessee Republican over Twitter.

Trump said Corker begged him to endorse his Senate bid, but Trump declined the request.

“Senator Bob Corker ‘begged’ me to endorse him for re-election in Tennessee. I said ‘NO’ and he dropped out (said he could not win without my endorsement),” Trump said. 

“He also wanted to be Secretary of State, I said ‘NO THANKS.’ He is also largely responsible for the horrendous Iran Deal!”

Corker's chief of staff, Todd Womack, on Sunday pushed back against Trump's claims.

"The president called Senator Corker on Monday afternoon and asked him to reconsider his decision not to seek reelection and reaffirmed that he would have endorsed him, as he has said many times," Womack said.

Corker said in a New York Times interview that Trump's threats to other countries could put the U.S. "on the path to World War III."