Massachusetts Sen. Elizabeth Warren will hit Donald Trump hard on Saturday when she delivers a blistering keynote address at her state's Democratic convention in Lowell, Mass.

According to her prepared speech, Warren, who has sparred with the presumptive Republican presidential nominee on Twitter recently, will again go after Trump's "offensive" rhetoric and paint him as a potentially catastrophic commander in chief.

On Trump University, which currently faces separate civil fraud cases and has become a thorn in the billionaire's side as of late, Warren compares it to a used car dealership, "except that's not fair to use car dealerships."

"His playbook said to look for people with problems; they make good targets," she says. "These were ordinary folks who were targeted because they had problems and Trump saw they were vulnerable and he could make a buck."

Warren continues, "Here's a man who builds a business to profit off other peoples' pain. He wants to be commander in Chief, but he's only qualified to be Fraudster-in-Chief."

The progressive senator, who has declined to endorse either Democratic candidate in the primary, says she is proud to belong to a party that "doesn't debate over who has the tiniest hands or who can build the longest, tallest, stupidest wall between us and Mexico."

Trump drew criticism from a female reporter during a press conference last month after he referred to Warren as "Pocahontas" when responding to a question.

"Let's properly check goofy Elizabeth Warren's records to see if she is Native American. I say she's a fraud!" he tweeted in early May.