President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Sunday night doubled down amid a growing backlash over his earlier tweets telling a group of Democratic congresswomen that they should "go back" to the countries that they came from.

"So sad to see the Democrats sticking up for people who speak so badly of our Country and who, in addition, hate Israel with a true and unbridled passion. Whenever confronted, they call their adversaries, including Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE, 'RACIST,'" Trump said in a pair of tweets.

"Their disgusting language and the many terrible things they say about the United States must not be allowed to go unchallenged. If the Democrat Party wants to continue to condone such disgraceful behavior, then we look even more forward to seeing you at the ballot box in 2020!" he continued.

....and the many terrible things they say about the United States must not be allowed to go unchallenged. If the Democrat Party wants to continue to condone such disgraceful behavior, then we look even more forward to seeing you at the ballot box in 2020! — Donald J. Trump (@realDonaldTrump) July 15, 2019

Trump was responding to outrage over comments he made earlier on Sunday in which he targeted a group of unnamed progressive congresswomen "who originally came from countries whose governments are a complete and total catastrophe."

In the tweets, which appeared to be directed at Reps. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.), Ilhan Omar Ilhan OmarOmar fires back at Trump over rally remarks: 'This is my country' Trump attacks Omar for criticizing US: 'How did you do where you came from?' Democrats scramble on COVID-19 relief amid division, Trump surprise MORE (D-Minn.), Rashida Tlaib Rashida Harbi TlaibTrump attacks Omar for criticizing US: 'How did you do where you came from?' George Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge MORE (D-Mich.) and Ayanna Pressley Ayanna PressleyFauci, Black Lives Matter founders included on Time's 100 Most Influential People list Trump attacks Omar for criticizing US: 'How did you do where you came from?' Pressley applauded on House floor after moving speech on living with alopecia MORE (D-Mass.), the president suggested they "go back and help fix the totally broken and crime infested places from which they came."

Trump's comments were swiftly condemned as racist by his critics. All four of the freshman congresswomen are U.S. citizens, and only Omar, who came to the U.S. as a refugee from Somalia, was born outside the U.S.

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The furor over Trump's tweets offered an increasingly fractious Democratic Party the chance to unify in its criticism of the president. The party has been riven by infighting over the past week, sparked by an interview Speaker Nancy Pelosi (D-Calif.) gave to The New York Times last Sunday in which she made remarks about the freshman congresswomen that were seen by some as dismissive.

The tensions within the party escalated after Ocasio-Cortez told The Washington Post that she felt Pelosi was targeting women of color, though the New York Democrat said she doesn't believe the Speaker is racist.

The dispute was further amplified on Friday after the House Democratic Caucus's official Twitter account tore into Ocasio-Cortez's chief of staff, Saikat Chakrabarti, over comments he made about Rep. Sharice Davids Sharice DavidsTrump asked Chamber of Commerce to reconsider Democratic endorsements: report Races heat up for House leadership posts GOP leader says he doesn't want Chamber's endorsement: 'They have sold out' MORE (D-Kan.), who is Native American.

Nonetheless, Trump's tweets Sunday provided Democrats with an opportunity to show a united front, however temporary.

Democrats across the spectrum, from Ocasio-Cortez's fellow progressives to close Pelosi allies such as Rep. Hakeem Jeffries Hakeem Sekou JeffriesDemocratic leaders: Supreme Court fight is about ObamaCare Pelosi: House will stay in session until agreement is reached on coronavirus relief Races heat up for House leadership posts MORE (D-N.Y.), denounced the tweets, with Jeffries calling Trump a "racial arsonist."

Trump waded into the intraparty dispute earlier in the week, telling reporters that he felt Ocasio-Cortez was being "disrespectful" to Pelosi.