WASHINGTON >> A Republican lawmaker abruptly adjourned a congressional hearing Tuesday after being challenged for referring to Rep. Sarah McBride, D-Del., the first openly transgender lawmaker in Congress, as a man.

The Europe Subcommittee of the House Foreign Affairs panel was in the middle of a hearing on arms control and U.S. assistance to Europe when its chair, Rep. Keith Self of Texas, introduced his colleague by calling her “Mr. McBride.”

McBride, who entered Congress knowing she would present a unique target for Republicans who have politicized and attacked transgender people, has generally chosen to let such moments slide. On Tuesday, she briefly registered her displeasure by returning Self’s slight, responding, “Thank you, Madam Chair,” before proceeding with her remarks.

But Rep. William Keating of Massachusetts, the ranking Democrat on the subcommittee, was not willing to move on. He interrupted to request that Self repeat his introduction, which he did, again referring to the Delaware Democrat as “Mr. McBride.”

“Mr. Chairman, you are out of order,” Keating fired back. “Mr. Chairman, have you no decency? I mean, I’ve come to know you a little bit. But this is not decent.”

Self said it was time to continue the hearing. But Keating refused to let go.

“You will not continue it with me unless you introduce a duly elected representative the right way,” he said.

With that, Self then adjourned the session.