Former professional boxer Mike Tyson popped up at the White House on Friday, briefly speaking to reporters in the West Wing briefing room and pledging support for President Trump. Tyson told reporters he was asked by the White House to travel with Trump to Syracuse, N.Y., for a rally the president is slated to host there. The boxer laughed when journalists in the briefing room asked him what he and Trump planned to talk about and prompted a White House staffer to jokingly interject “no tough questions,” as people in the room laughed. Asked how Republicans would fare in the...