Corey Comperatore, 50, was killed while attending a rally for Donald J. Trump for the first time. The widow of the slain victim in Saturday’s shooting in Pennsylvania spoke with former President Donald J. Trump on Tuesday, she said in a social media post. “He was very kind and said he would continue to call me in the days and weeks ahead,” Helen Comperatore wrote, adding that she had told the former president that her husband, Corey Comperatore, “left this world a hero, and God welcomed him in.” Mr. Comperatore’s sister, Kelly Comperatore Meeder, said members of the family had...