In blow to GOP unity, Trump refuses to back Ryan, McCain

Republican presidential nominee Donald Trump said Tuesday that he is refusing to endorse House Speaker Paul Ryan and Sen. John McCain just two weeks after pledging to bring the fractured GOP together at the party's nominating convention. He also ripped into New Hampshire Sen. Kelly Ayotte in the same interview with the Washington Post. All three have primary challengers, and all three disapproved of Trump's criticism of the Muslim American parents of an Army captain killed in Iraq.