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Trump argued to the GOP that the previous war powers resolution, which passed on Tuesday thanks in part to a pair of Republicans being absent, hurt the administration's negotiating position with the Iranians.

Meetings with key holdouts at the White House helped change the minds of Cassidy and Sen. Rand Paul, R-Ky., who has routinely voted with Democrats on every war powers resolution brought forward, and provided the administration with a win as they work toward a deal beyond the 60-day memorandum of understanding with Iran.

"I want to thank Vice President \[JD\] Vance and Special Envoy \[Steve\] Witkoff for the thorough briefing this afternoon on Iran," Cassidy said on X. "I appreciate the quick invitation to the White House to address many of my concerns." 

And Paul, who voted present, noted that his "opinion on the debate over war and executive power has not changed and I have voted that way several times."

"But since hostilities seem to be over and the President asked me to give consideration to his negotiating position, I will do so," Paul said on X. "My vote of present is a way to give the President more space and leverage to negotiate a lasting peace."

Closed-door outburst turns into victory for Trump’s Iran negotiations.