Kavanaugh was questioned by the police after a brawl in 1985

The outline of the incident was first mentioned in a statement released Sunday by Chad Ludington, one of Judge Kavanaugh's classmates and a member of the Yale basketball team.

"On one of the last occasions when I voluntarily socialized with Brett, I saw him respond to a semi-hostile remark, not by defusing the situation, but by throwing his beer in the face of the man," said Mr. Ludington in his statement. Mr. Ludington, a professor at the University of North Carolina, stated that he had come forward because he thought that Judge Kavanaugh had misinterpreted the extent of his Alcohol consumption at Yale.

Mr. Ludington stated that he had been in contact with the F.B.I.

He added that the altercation took place after a UB40 concert, when a group of people had gone to Demery's home and drank pint. At one point, they were sitting next to a man who, they thought, looked like Ali Campbell, the singer of the band UB40.

"We are trying to find out if it's him," he said.

When the man noticed that Mr. Ludington, Mr. Kavanaugh and the others were watching him, he objected and ordered them to stop, adding a compliment, Mr. Ludington said.

Mr. Kavanaugh cursed, he said, and then "threw his beer at the guy."

"The guy has switched to Brett," continued Ludington. At that moment, Mr. Dudley "took his beer and stuffed it into the guy's head, who had now caught Brett in his arms. I then tried to pull Chris back, and several other guys tried to pull the other guy back. I do not know what Brett was doing in the fray, but there was blood, there was glass, there was beer and screams, and the police arrived. "

Demery's, which closed in 1994, was a well-known local bar that served large pies of pizza and cheap beer, especially after 9 pm. According to thepolitic.org, this attracted a crowd that included "older Yalies and younger ones with good fake identity cards".

Mr. Dudley, who after Yale went to N.B.A. and was the Republican nominee for the Oregon governor in 2010, ruled in favor of Kavanaugh's appointment to the Supreme Court and disputed reports that he drank too much.

Several classmates in Yale, including a former roommate and Mr. Ludington, described Judge Kavanaugh as sometimes aggressive when he drank.