GOP senator warns Trump: Anyone who trash-talks McCain 'deserves a whipping'

Sen. Johnny IsaksonJohn (Johnny) Hardy IsaksonOn The Money: Lawmakers wait for Trump verdict on border deal | Trump touts deal as offering B for security | McConnell presses Trump to sign off | National debt tops T | Watchdog details IRS shutdown woes Trump criticizes border wall deal: 'Can't say I'm happy' GOP senators offer praise for Klobuchar: 'She’s the whole package' MORE (R-Ga.) on Monday warned President TrumpDonald John TrumpRosenstein expected to leave DOJ next month: reports Allies wary of Shanahan's assurances with looming presence of Trump States file lawsuit seeking to block Trump's national emergency declaration MORE or any other critics against speaking negatively about GOP Sen. John McCainJohn Sidney McCainGOP senator says Republicans didn't control Senate when they held majority Pence met with silence after mentioning Trump in Munich speech Mark Kelly's campaign raises over M in days after launching Senate bid MORE (Ariz.) as the nation mourns his death this week. 

"I don't know what's going to be said in the next few days about John McCain ... but anybody who in any way tarnishes the reputation of John McCain deserves a whipping, because most of the ones who would do the wrong thing about John McCain didn't have the guts to do the right thing when it was their turn," Isakson said from the Senate floor. 

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He added that he would convey "to the president or anybody in the world, it's time to pause and say this was a great man. He gave everything for us. We owe him nothing less than the respect that he earned." 

Isakson's speech came as Trump has faced backlash over his handling of McCain's death. He sent a tweet on Saturday expressing sympathy for McCain's family but reportedly nixed releasing a statement that called the 81-year-old former GOP presidential nominee a "hero." 

Trump appeared to reverse course on Monday afternoon. The White House released a statement from Trump expressing "respect" for McCain despite their political differences.

Trump also ordered flags to fly at half-staff after being criticized when he returned them to full staff less than 48 hours after McCain’s death.

Trump and McCain had frequently criticized each other, going back to the first days of the president's White House campaign. Trump had recently taken to mocking McCain at campaign rallies for his thumbs-down "no" vote on ObamaCare repeal, and McCain denounced as "disgraceful" Trump's widely derided press conference with Russian President Vladimir Putin.