The shooting of two National Guard members the day before in Washington hung over President Trump’s Thanksgiving events at Mar-a-Lago, where he held a call with members of the military to thank them for their service on the holiday. At the beginning of the call, he revealed that one of the Guard members, Army Specialist Sarah Beckstrom, had died. “It’s just happened,” Mr. Trump said. “She was savagely attacked. She’s dead. Not with us.” The other victim, he said, was “fighting for his life.” Later, a White House official said that the president had spoken with the family of the...