Elizabeth Warren Fires Back at Trump: "Really? That's the Best You Could Come Up With?"

Elizabeth Warren is not impressed.

That's what the Massachusetts senator made clear in an interview with Mic, as she responded to presumptive Republican presidential nominee Donald Trump's new moniker for her: "Goofy Elizabeth Warren."

"Really? That's the best you could come up with? Come on. I thought Donald Trump said he was a guy that was good with words," Warren said in a sit-down with Mic's Zeeshan Aleem. The full interview will be available Thursday.

Warren vs. Trump: The real estate magnate's jab at the progressive favorite came during a Twitter broadside against Warren, who made waves with an impassioned warning against Trump's "toxic stew of hatred and insecurity."

Warren has taken on an increasingly prominent role as an attack dog against Trump, stoking speculation that likely Democratic nominee Hillary Clinton will tap the senator to serve as her running mate — a possibility Warren wouldn't foreclose in her interview with Mic.

Read more: Elizabeth Warren Won't Rule Out Being Hillary Clinton's 2016 Vice Presidential Nominee

Bring them on, Trump said during his Friday night tweetstorm, hitting Warren on her disputed claims of Native American ancestry.

"I don't think he likes that." Asked why she thought Trump responded so viscerally, Warren said he fears being held accountable.

"I don't know if it's that Donald Trump is not used to people who stand up and challenge him, and I don't mean on silly stuff, or on personal stuff. This is really about the issues he's put on the table and talking about him, Donald Trump," she said, accusing him of "defrauding students" through the for-profit Trump University and "cheating others" by declaring bankruptcy.

"I don't think that's where Donald Trump wants to be, the idea that he has to be held accountable, I don't think he likes that," Warren continued. "I think he's actually a lot weaker than he wants to admit."

Check back Thursday morning for our full interview with Warren on student debt, Trump and the 2016 campaign.