Speaking at the New Hampshire Democratic State Convention on Saturday, Warren pilloried the presumptive GOP presidential nominee over his statements about people of color and women, and over Trump University, calling him a “proven failure” who is unfit to lead.

"Every day we learn more about him, and every day it becomes clearer that he is just a small, insecure money-grubber who doesn't care about anyone or anything that doesn't have the Trump name splashed all over it. Every day it becomes clearer that he is a thin-skinned, racist, sexist bully," Warren said. "Every day it becomes clearer that he will never be president of the United States."

Even before she endorsed Hillary Clinton for president last week, there has been speculation that Warren would join the White House ticket. Neither woman has revealed whether Warren is being considered as a running mate, but the two held private meetings over the past week. Even if Warren doesn't come on, the senator is proving to be a powerful advocate for Clinton and antagonist of Trump.

Warren took aim at one of Trump’s vulnerabilities, the “university” he founded that now finds itself tangled up in lawsuits, accused of cheating students out of their money.

"It was like a used car dealership, except that’s not fair to used car dealerships," Warren chided.

"Here is a man who runs a business to profit off other people’s pain,” she said.

Pointing to the mogul’s move to block the release of his video testimony in the Trump University case, Warren said, "Poor little Donald is shaking in his high-priced Italian loafers, begging the court to protect him."

"Are you scared, Donald? You should be," Warren said to cheers.

Warren contrasted Trump with Clinton, whom she called a "fighter."

"We can whine about Donald Trump. We can whimper about Donald Trump. Or we can fight back," she said. "Me? I'm fighting back."

Editor's note: Donald Trump regularly incites political violence and is a serial liar, rampant xenophobe, racist, misogynist and birther who has repeatedly pledged to ban all Muslims -- 1.6 billion members of an entire religion -- from entering the U.S.