CLEVELAND — While Hillary Clinton unveiled an emotional television ad featuring the parents of a slain Muslim American Army captain, Donald Trump assured supporters he would have no regrets if he loses the presidential election because he was going all out in the final weeks of the campaign. “I will be happy with myself,” Trump said. Trump planned to lay out his closing arguments for support with a speech Saturday in Gettysburg, Pennsylvania, focusing on the priorities for the first 100 days of his presidency.