Senate Majority Leader Mitch McConnell Declines to Say If Trump Is Qualified to Be POTUS

"That will be up to the American people to decide," McConnell said.

"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."

A new ABC News/Washington Post poll released today shows 64 percent of Americans, a new high, say Trump is unqualified to serve as president.

"He won the Republican nomination fair and square," McConnell said. "He got more votes than anybody else, against a whole lot of well-qualified candidates, and so our primary voters have made their decision as to who they want to be the nominee," he said. "The American people will be able to make that decision in the fall."

McConnell offered reassurance to Will, whom he called a friend: "The Republican Party is still going to be America's conservative party," McConnell told Stephanopoulos, adding that the party's platform will include basic principles Republicans believe in.

"Our nominee may not agree with every single one of those, but the Republican Party, it will remain America's conservative party," he said. "The platform will be a traditional Republican platform...and I don't expect it to differ that much from the platform we had four years ago.