President Trump got barely two minutes into his speech to a joint session of Congress on Tuesday night before Representative Al Green, Democrat of Texas, stood to protest, disrupting the proceedings in a display that ultimately got him thrown out of the House chamber.

As Mr. Trump extolled his own accomplishments during his first weeks in office and boasted about his electoral success in November, Mr. Green, 78, rose from his seat, shook his cane and began to shout.

“You have no mandate to cut Medicaid!” yelled Mr. Green, who often creates headaches for Democrats by deviating from party orders.

Almost instantly, he was drowned out by chants from angry Republican colleagues: “U.S.A.! U.S.A.!” they shouted and clapped, which gave way to shouts of “Sit down!”

Twice, Speaker Mike Johnson interrupted the president’s address, tapped his gavel and warned Mr. Green that if he did not sit down, he would be removed from the chamber.

“Mr. Green, take your seat, sir,” Mr. Johnson said, as Mr. Green stood defiantly, refusing.

Behind Mr. Trump, Vice President JD Vance made a gesture with his thumb indicating “throw him out,” as members jeered. Soon, Mr. Johnson read from a sheet of paper in front of him, making it official.