Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE's (D-Calif.) presidential campaign sent a fundraising email to supporters on Thursday with a message slamming President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE for his "gendered" attack against the California senator.

The email came in response to the president labeling Harris's line of questioning toward Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE during a Senate Judiciary Committee hearing as "probably very nasty." In the email, the Harris campaign jabbed Trump for using similar language to the famous "nasty woman" insult he lobbed at Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE during a presidential debate in 2016.

"It seems like anytime Donald Trump feels threatened by a strong woman, he lashes out with this gross, weird attack," the message read. "It’s the kind of sexism that makes me want to run my head through a wall."

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"You’d think, after three years, he could at least come up with something more original," Harris's campaign wrote.

The campaign warned that Trump's attacks on Harris "are only going to get worse," and asked supporters to donate so that the 2020 contender can take on the president head-on in a debate.

The email comes a day after Trump told a Fox Business host that Harris had "probably" been "very nasty" to Barr during the hearing. He said earlier in the week that Harris has "a little bit of a nasty wit, but that might be it."

The senator responded during a CNN appearance Thursday morning, and said that "God only knows" why the president uses that word.

“We have a president of the United States whose primary interest I think that has been clear as a result of what we know as a result of the Mueller report, his primary interest has been to obstruct justice," Harris said. "My primary interest is to pursue justice. You can call that whatever name you want, but I think that's what the American people want in a leader.”