Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) asked supporters on Monday to donate to four progressive congresswomen targeted by 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 in a series of tweets telling them to “go back” to other countries.

“When I call Donald Trump a racist, this is what I’m talking about,” Sanders said in a text message to supporters, referring to Trump's tweets 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.), 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.) and 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.). All four are U.S. citizens and all but Omar were born in the U.S.

“Please split a contribution between Alexandria Ocasio-Cortez, Ilhan Omar, Ayanna Pressley, Rashida Tlaib, and our campaign for president,” the donation page reads. “Your contribution will send a message that Trump’s racism will not stand."

I've said all along that Trump is a racist. He is proving that point yet again by attacking Reps. @IlhanMN, @RashidaTlaib, @AyannaPressley and @AOC.



Split a contribution between their campaigns and ours to send a message that his racism will not stand: https://t.co/eIDruqZtMe — Bernie Sanders (@BernieSanders) July 15, 2019

Sanders, like the four congresswomen, is associated with the progressive wing of the Democratic party, and on Sunday said House Speaker 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 (D-Calif.) was being “a little bit” too tough on Ocasio-Cortez amid ongoing tensions between the two after Pelosi dismissed the four congresswomen's influence in an interview with the New York Times.

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"I think you cannot ignore the young people of this country who are passionate about economic and racial and social and environmental justice,” Sanders said Sunday on NBC’s “Meet the Press.” “You've got to bring them in not alienate them."

Sanders tweeted a link to the fundraiser around the same time that the four held a press conference responding to Trump’s tweets, in which Omar said the “blatantly racist” attack demonstrated “the agenda of white nationalists.”