Another House panel was scheduled to question the mayor of Washington, D.C., on Wednesday over the city’s handling of a pro-Palestinian protest encampment at George Washington University. But the police moved in overnight to break up the encampment, and that hearing was called off.

Chief Pamela Smith of the Metropolitan Police Department said at a news conference Wednesday morning that while the campus protest had begun peacefully on April 26, there had been a recent “escalation in the…