House Minority Leader Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) slammed 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 over his comments about 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 on Thursday night.

Trump at the campaign-style rally in Montana called Waters a “low-IQ individual,” a claim that he has repeated many times. He speculated her IQ is “somewhere in the mid-60s.”

The average IQ is 85-114, and a mid-60s IQ indicates mental challenges.

“.@realDonaldTrump, instead of making despicable attacks on @RepMaxineWaters, why don’t you focus on reuniting the children you put into cages back with their families?” Pelosi tweeted Thursday night. “It’s been 9 days since a federal judge ordered you to. #FamiliesBelongTogether.”

.@realDonaldTrump, instead of making despicable attacks on @RepMaxineWaters, why don’t you focus on reuniting the children you put into cages back with their families? It’s been 9 days since a federal judge ordered you to. #FamiliesBelongTogether https://t.co/YO1tTFg6gM — Nancy Pelosi (@NancyPelosi) July 5, 2018

Trump also took shots at Pelosi and Senate Minority Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (D-N.Y.) at his rally Thursday night, while calling Waters – a vocal Trump critic who has called for his impeachment – “the new leader of the Democrat Party.”

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The president included the jabs while attacking Sen. Jon Tester (D-Mont.), who is running for reelection this year in a state Trump won in the 2016 election. Tester's GOP opponent, Matt Rosendale, joined Trump at Thursday’s rally.

"A vote for Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE is a vote for Chuck Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE, Nancy Pelosi and the new leader of the Democrat Party, Maxine Waters," Trump said. "Where have they gone?"

Waters, who has long called for Trump’s impeachment, faced significant backlash last week for her comments encouraging her supporters to confront Trump administration officials in public.

“I have no sympathy for these people that are in this administration who know it is wrong, what they're doing, on so many fronts but they tend to not want to confront this president," Waters said at a Los Angeles rally.

“For these members of his Cabinet who remain and try to defend him ... The people are going to turn on them; they're going to protest. They're going to absolutely harass them until they decide that they're going to tell the president 'no I can't hang with you, this is wrong, this is unconscionable and we can't keep doing this to children,'" she said.

Waters and Pelosi’s comments come as the Trump administration continues to face scrutiny over its zero tolerance immigration policy, which resulted in migrant children being separated from their parents at the border.

Trump signed an executive order ending the family separation practice last month, but federal agencies are scrambling to reunite families that were separated while the adults faced prosecution for illegally crossing the border.

A federal judge on June 26 ordered the Trump administration to immediately move to reunify immigrant families that were separated under the administration’s hard-line immigration policy.

While the Department of Health and Human Services (HHS) is working to reunite families, HHS Secretary Alex Azar said "under 3,000" migrant children remain in government custody.