Senator Elizabeth Warren (D-MA) and Nevada Democratic Senate nominee Jacky Rosen fired back at President Donald Trump after he hurled insulting nicknames and slurs at the two women during a fundraiser in Las Vegas on Saturday.

While offering his endorsement of incumbent Senator Dean Heller (R-NV), whom Rosen is challenging this fall, Trump once again peddled his claim that Democrats were obstructing his administration's agenda on immigration.

"On immigration, we have to be very strong," Trump said, blaming Democrats for what he perceives as an illegal immigration crisis. "The fact is we need more Republicans because the Democrats are obstructionists."Trump then teased the audience with a "great nickname" he came up with for Rosen, whom Trump accused of wanting to raise taxes. The crowd cheered and encouraged Trump to say it even though he said he "shouldn't."

Of course, he caved, referring to Rosen as "Wacky Jacky."

Then the president added:

"Wacky Jacky is campaigning with Pocahontas. Do you believe this?" (Pocahontas is Trump's racist nickname for Warren.) He continued: "When you see that, that's not the senator you want."

Rosen quickly pounced on Trump's remarks. In a tweet, Rosen said she "is not afraid to stand up to him."

Rosen also released a statement stating that "the President is attacking me with lies and petty insults because I'm not afraid to stand up to him."

"Dean Heller has been a rubber stamp for Donald Trump in Washington, caving to the President's divisive agenda at Nevada's expense, Rosen added.

Warren also fired back at Trump on Twitter. The Massachusetts Democrat said Trump was "hoping to distract" from his policy of separating immigrants from their parents "by attacking me & @RosenforNevada at a campaign rally in Vegas today."

In a second tweet, Warren said that Rosen "will vote to sink his agenda in the Senate."

Warren then blasted Trump's use of "Pocahontas," telling the president that if he wants to "talk about Native Americans," he should "try listening to what the National Congress of American Indians says about the pain you're inflicting on children & families."