WASHINGTON — President Donald Trump berated Senate Republicans during a visit to the Capitol Wednesday for allowing a vote to block his war in Iran, further escalating a feud that has diverted GOP efforts to focus on election-year affordability issues and brought much of the chamber's business to a halt.

Invited to speak at the GOP luncheon by Florida Sen. Rick Scott, Trump had signaled ahead of time that he would use the closed-door meeting to push senators to pass his proof-of-citizenship voting bill. But the conversation was more focused on Tuesday's vote to approve the war powers resolution, a mostly symbolic measure that allows Congress to rebuke the administration's military actions. The House passed its own version of the resolution earlier this month.

Trump had particular words for the four Republican senators who voted with Democrats on the measure — Republicans Lisa Murkowski of Alaska, Susan Collins of Maine, Rand Paul of Kentucky and Bill Cassidy of Louisiana — after calling them "losers" on social media.

Most Republicans stayed quiet. But Cassidy, who lost re-election in his primary last month after Trump endorsed an opponent, stood up and defended his vote.

"I stood and said, 'You have not told the American people what's going on,'" Cassidy told reporters after the meeting. "This was supposed to last four weeks, it's lasted four months. Our original objectives have not been achieved."

The two men "went back and forth," Cassidy said, and he "matched his tone and volume" until someone told him to sit down and he tried to de-escalate. But Cassidy said that he did not want to be bullied.

"I am voting for war powers until I get a briefing," he said afterward.

Trump repeatedly told Cassidy to sit down, according to a person familiar with the private meeting who was not authorized to discuss it. At one point, the president called the senator a "lunatic."

Publicly, Trump said afterward that they had "a really great meeting." But he hinted at the discord.

"We like everyone in the room," Trump said. "I don't like a few people, but that's okay"

The meeting capped weeks of friction between Trump and Senate Republicans and added a new layer of frustration as Tuesday's vote was the first time the Senate had adopted a war powers resolution on the Iran war. Trump made clear he was in no mood to compromise before it even started, calling off a scheduled signing ceremony on a housing bill that passed both chambers overwhelmingly this week and that GOP lawmakers were touting as an election-year achievement.

Republican senators were eager for a conciliatory meeting with the president after escalating tensions in recent weeks. But Trump upended their plans when he declared on social media just beforehand that he wouldn't sign the legislation until they send him the SAVE America Act, his bill to require proof of citizenship for all voters.

House Speaker Mike Johnson, R-La., suggested Wednesday that Republicans could pass the SAVE America Act through the budget reconciliation process, which would require only support from a simple majority in the Senate.

North Carolina Sen. Thom Tillis said before the meeting that he doesn't know why Trump is holding the housing bill "hostage" for the voting bill that "will never pass in this Congress."

"It makes no sense to me," Tillis said as he walked into the luncheon.

Senate Majority Leader John Thune, R-S.D., said the housing legislation, which aims to lower costs, is "an affordability issue," Thune said, "and eventually I hope he finds a way to sign it."

The White House did not immediately respond when asked whether Trump would veto the legislation. But his apparent reversal on the measure that Republicans have touted ahead of the election is likely to only aggravate the deepening split between the president and his Republican majorities on Capitol Hill.

Democrats were quick to condemn Trump's cancellation of the bill signing.

"We should be here today to celebrate because we should have a housing bill that is now law," Sen. Elizabeth Warren, D-Mass., said at a news conference in front of the U.S. Capitol on Wednesday afternoon. "Instead, we are here with a call to action. The call is, sign the bill, Mr. President."

As the top Democrat on the Senate Banking Committee, Warren played a leading role in crafting the bipartisan bill to make housing more affordable.

"It's remarkable that we made it this far and got something so good," she said. "All we need is Donald Trump to say 'yes.'"

House Minority Whip Katherine Clark, D-Mass., accused Johnson and other Republican lawmakers of betraying their duty to the American people to appease the president. 

"They are willing to sabotage legislation that has already passed and force Americans to quite literally pay the price," she said.

Trump's move on the housing bill is his latest reversal after weeks of being at odds with Senate Republicans.

Trump has blocked the Senate from confirming one of his own nominees, asked them to fund parts of his White House ballroom project despite opposition and forced them to defend the Iran war even as they question the strategy and endgame.

By rejecting a public bill signing, Republicans worry that Trump is also indicating a level of indifference to voters' affordability concerns heading into November's midterm elections.

Trump has also helped whittle down his own support in the Senate after endorsing primary challengers to two GOP incumbents who were previously reliable votes for his agenda — Cassidy and Texas Sen. John Cornyn. Both men have become more critical of Trump since losing re-election.

"If we're going to win the midterm elections, we need to get on the same page," Cornyn said ahead of the meeting. "We're not on the same page now, and that I think is dangerous."