A Pennsylvania man said he rescued a woman from Capitol rioters on Jan. 6. Video shows him punching a cop in the head.

Jim Robinson, of Schwenksville, Pennsylvania, told a federal judge last year he’d entered the U.S. Capitol on Jan. 6, 2021, only to help people in distress — including a 60-year-old woman he says he rescued from nearly being trampled by the mob that had stormed the building. Newly discovered surveillance footage says otherwise, prosecutors said, as the 61-year-old martial arts instructor was sentenced Tuesday to six months in prison. The video, Assistant U.S. Attorney Michael Lawrence Jones told the court, offers no evidence to support Robinson’s contention that he helped anyone. Nor does it s...