Clinton, who on Tuesday night claimed the title of presumptive Democratic nominee, was asked about a Democratic senator's recent comments on the idea of Sen.(D-Mass.) as Clinton's running mate.

"I’m not going to get into vice presidential choices, but I have the highest regard for Senator Warren," Clinton responded when asked about his comments.

Clinton became the first female presumptive nominee for a major political party this week, extending her delegate lead with wins in several states, including New Jersey and California, on Tuesday. Clinton told ABC that becoming the first woman elected president is also part of her "unfinished business."

"It is of course symbolic, but symbols mean something and symbols often can spark hope and action in people, particularly young people, and I think it will be a real milestone with my nomination for our country, but it will also send a signal around the world," Clinton said.