President Donald Trump engaged in a heated exchange with Republican Senator Bill Cassidy during a private lunch with Senate GOP members on Capitol Hill. The dispute reportedly involved Trump questioning Cassidy's vote on a war powers resolution related to Iran, escalating into raised voices and personal remarks.

According to Senator Cassidy, the confrontation began when he responded to Trump's query about the vote. Cassidy stated he told the president, "You have not told the American people what's going on." He explained his vote on the war powers resolution was due to a lack of transparency regarding the ongoing U.S. involvement in Iran, which he said had lasted longer than initially stated and had not achieved its original objectives.

Cassidy recounted that when he informed Trump he would continue to vote for such resolutions until a congressional briefing on Iran developments was provided, the president "did not particularly care for my comments" and "raised his voice."

One individual familiar with the private meeting, who spoke anonymously, reported that Trump repeatedly told Cassidy to sit down and at one point called the senator a "lunatic."

Cassidy acknowledged losing his temper, calling his behavior "not appropriate," but added that he "matched his tone and volume" before eventually sitting down to "de-escalate." He emphasized that the American people need more information than they are being provided.

The exchange marked a notable public airing of frustration from a Republican senator towards the president, deviating from the common posture of many congressional Republicans who largely avoid public criticism of Trump. The incident also highlighted growing unease among some Republicans regarding their electoral prospects amid the ongoing situation with Iran.

The animosity between Trump and Cassidy has been long-standing. Trump had previously endorsed a rival candidate against Cassidy in Louisiana's Republican primary. Cassidy became the first incumbent senator in 14 years to lose a primary election, a defeat largely attributed to his vote to convict Trump in the impeachment trial following the Jan. 6, 2021, attack on the U.S. Capitol.

Cassidy stated that Trump brought up his election defeat during their argument, describing the president's comments as attempts "to demean another person."

Before losing his primary, Cassidy had largely supported Trump's policies and nominees. However, since his defeat, he has adopted a more critical stance, free from the need to appeal to Trump-loyal Republican voters. Cassidy reiterated his stance that "it does not appear... that the course of (the Iran war) is going the way that we were told," and he "make[s] no apologies for standing up to the president" to demand more information be shared with the Senate and the public.

Some Republican colleagues attempted to downplay the incident. Senator Roger Marshall of Kansas told reporters, "Y'all act like no one ever yelled at each other." Senator Tommy Tuberville of Alabama described the encounter as a "halftime talk," suggesting that "both of them got a lot off their chests."

However, Senator John Cornyn of Texas, who also lost a primary to a Trump-backed challenger shortly after Cassidy, offered a dry observation about the meeting, which had been advertised as a chance for unity. Asked if he was being sarcastic about the "unity message," Cornyn stepped into an elevator without answering.