Republican Senate Majority Leader Mitch McConnell declined Sunday to say if Donald Trump, his party's presumptive presidential candidate, is qualified to be president. "Well, look, I think it's no question that he's made a number of mistakes over the last few weeks. I think they're beginning to right the ship. It's a long time until November. And the burden obviously will be on him to convince people that he can handle this job," McConnell said on ABC's This Week.