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 on Wednesday slammed Rep. Maxine Waters Maxine Moore WatersPowell, Mnuchin stress limits of current emergency lending programs Pelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book MORE (D-Calif.) during a rally in North Dakota, furthering his feud with the California Democrat after she called for protests against Trump officials.

Trump headlined an event in Fargo, N.D., to rally support for Rep. Kevin Cramer Kevin John CramerMomentum growing among Republicans for Supreme Court vote before Election Day On Paycheck Protection Program, streamlined forgiveness is key McConnell shores up GOP support for coronavirus package MORE (R-N.D.), who is running against vulnerable incumbent Sen. Heidi Heitkamp Mary (Heidi) Kathryn HeitkampHarris faces pivotal moment with Supreme Court battle Centrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents MORE (D-N.D.) in November. A few minutes into his remarks, Trump hit Heitkamp for supporting Democratic leadership.

“When Heidi ran for office, she promised to be an independent vote for the people of North Dakota. Instead she immediately joined Chuck [Schumer (D-N.Y.)] and Nancy [Pelosi (D-Calif.)],” Trump said.

“And now they have a new leader. Who’s the leader?” Trump asked the crowd. “Maxine Waters is their new one.”

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Waters sparked controversy over the weekend when she encouraged supporters to confront Trump administration officials in public spaces.

Her comments followed a week in which a restaurant owner refused to serve White House press secretary Sarah Huckabee Sanders and protesters confronted Department of Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE and White House adviser Stephen Miller in separate instances while they dined at Mexican restaurants.

Waters later defended her comments, saying she believes in peaceful protest and noting that Trump has made more explicit threats against his opponents.

Democrats have largely distanced themselves from Waters's remarks, saying harassing political opponents is unacceptable.

Trump and Republicans have seized on the comments, arguing that they show Democrats are hypocritical and intolerant.

The president continued to stoke that sentiment Wednesday, saying at the rally that any vote for a Democrat in the November midterms serves as a vote for Waters, Pelosi and Schumer.

“Maxine. She is a beauty,” Trump said. “I mean, she practically was telling people the other day to assault — can you imagine if I said the things she said?"

“Horrible what she said. Now they want to censure her,” he said, referencing a measure introduced by a Republican lawmaker.

“Let’s see where that goes, folks,” Trump added.