Senate Foreign Relations Committee Chairman Bob Corker, R-Tenn., is questioned by reporters about a derisive exchange of name-calling with President Donald Trump, on Capitol Hill in Washington, Tuesday, Oct. 24, 2017. In a remarkable Republican war of words, Corker says Trump is "utterly untruthful" and debases the nation. Then the president fires back that the two-term lawmaker "couldn't get elected dog catcher." (AP Photo/J. Scott Applewhite)
Senate Foreign Relations Committee Chairman Bob Corker, R-Tenn., is questioned by reporters about a derisive exchange of name-calling with President Donald Trump, on Capitol Hill in Washington, Tuesday, Oct. 24, 2017. In a remarkable Republican war of words, Corker says Trump is "utterly untruthful" and debases the nation. Then the president fires back that the two-term lawmaker "couldn't get elected dog catcher." (AP Photo/J. Scott Applewhite) Credit: J. Scott Applewhite

WASHINGTON — A pair of senators from President Donald Trump’s own Republican Party blistered him with criticism Tuesday in a dramatic day of denunciation that laid bare a GOP at war with itself. Jeff Flake of Arizona declared he would not be “complicit” with Trump and announced his surprise retirement, while Bob Corker of Tennessee declared the president “debases our nation” with constant untruths and name-calling.

Corker, too, is retiring at the end of his term, and the White House shed no tears at the prospect of the two GOP senators’ departures. A former adviser to Steve Bannon, Trump’s ex-strategic adviser, called it all “a monumental victory for the Trump movement,” and Trump himself boasted to staff members that he’d played a role in forcing the senators out.

It was a stunning rebuke of sitting president from prominent members of his own party — and added to a chorus of criticism of Trump that has been growing louder and more public.

Corker leveled his own searing criticism of Trump in a series of interviews. “I think the debasement of our nation will be what he’ll be remembered most for and that’s regretful,” Corker said.

A furious Trump didn’t let that pass unremarked. On Twitter, he called Corker “incompetent,” said he “doesn’t have a clue” and claimed the two-term lawmaker “couldn’t get elected dog catcher in Tennessee.”

An overstatement to be sure, but White House spokeswoman Sarah Huckabee Sanders said in regard to the impending retirements, “The people both in Tennessee and Arizona supported this president, and I don’t think that the numbers are in the favor of either of those two senators in their states and so I think this was probably the right decision.”

Away from the cameras, Trump took credit for helping force the two departures, according to a White House official and an outside adviser, who insisted on anonymity to discuss private conversations.

Corker’s retirement plans also underscore the question of what the Republican Party will look like in years to come. Senate Majority Leader Mitch McConnell of Kentucky has warned that some candidates running with the backing of Trump allies could not win general elections. And even if they make it to the Senate, certain conservatives could make McConnell’s job even harder as he tries to maneuver legislation through a narrow majority that now stands at 52-48.

Steven Law, head of a McConnell-allied super PAC that supports GOP incumbents and establishment-aligned candidates, wasted no time issuing a statement declaring that Republican former state Sen. Kelli Ward, who was running against Flake with the encouragement of former Trump adviser Steve Bannon, “will not be the Republican nominee for this Senate seat in 2018.” Many fellow Republicans had expected Flake to lose the primary and hope they now can recruit a stronger candidate.

Earlier Corker had said of Trump, “His governing model is to divide and to attempt to bully and to use untruths.” He said that he and others in the party had attempted to intervene with Trump over the months, sometimes at the behest of White House officials, but “he’s obviously not going to rise to the occasion as president.”

“Unfortunately I think world leaders are very aware that much of what he says is untrue,” Corker said.