Hillary Clinton: 'I'll take Bernie Sanders over Donald Trump or Ted Cruz any time'
Hillary Clinton speaks to reporters in New York (ABC News/screen grab)

Democratic presidential candidate Hillary Clinton responded to charges from Bernie Sanders that she was "not qualified" to be president on Thursday by saying that the Vermont senator would be a better president that Donald Trump or Ted Cruz.

Before taking a ride on the subway in New York City, Clinton tried to downplay what has become an increasingly bitter rivalry with her Democratic opponent.

"I'm going to trust the voters of New York who know me," she told reporters. "And have voted for me three times, twice for Senate, once in the presidential primary."

"Look, I don't know why he's saying that," Clinton said. "But I will take Bernie Sanders over Donald Trump or Ted Cruz any time. So, let's keep our eye on what's really at stake in this election."

At a press conference on Thursday, Sanders explained that he would "fight back" if Clinton questioned his qualifications to be president.

“When you have headlines in the Washington Post, Clinton questions whether Sanders is qualified to be president, my response is, 'Well if you want to question my qualifications, let me suggest this. Maybe the American people might wonder about your qualifications, Madame Secretary.'”

Watch the video of Clinton below from ABC News.