Trump 'trafficking in hate and fear': Clinton

"I think all Americans should be concerned. It's clear that Donald Trump is running a very cynical campaign pitting groups of Americans against one another," Clinton said ahead of tomorrow's primaries.

"He is trafficking in hate and fear. He is playing to our worst instincts rather than our angels of our better nature," the former secretary of state said in response to a question.

Clinton, 68, said Trump, 69, incites violence in his audience.

"He actually incites violence in the way that he urges his audience on, you know, now talking about punching people, offering to pay legal bills, and then on the specifics, you know, we know that he has been incredibly bigoted toward so many groups, he talks about deporting eleven, twelve million immigrants we're a nation built on immigrants he talks about preventing Muslims from coming into our country we believe in religious freedom," she said.

"There's just so much of what he's doing that I think we all have to reject. Because it is so at odds with our values. You don't make America great by tearing down everything that made America great and so let's stand up and with one voice and reject that," Clinton said.

In response to another question, Clinton claimed foreign leaders are ready to endorse her to stop Trump.

"I am already receiving messages from leaders. I'm having foreign leaders ask if they can endorse me to stop Donald Trump," she said.

She did not name any foreign leaders, but did said the Italian Prime Minister Matteo Renzi has endorsed her publicly.

Clinton said she didn't want to "spill the beans right now, but suffice it to say, there are many arguments that we can use against him." 

"But one argument that I am uniquely qualified to bring, because of my service as secretary of State, is what [Trump's] presidency would mean to our country and our standing in the world," she said.

Earlier Clinton's sole Democratic presidential rival Bernie Sanders called Trump a pathological liar.