Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) put out a fundraising call using his campaign's email list Sunday night, imploring supporters to split a three-way donation between members of "the Squad."

In the email, Sanders suggested a donation of $5 each to the campaigns of Reps. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOcasio-Cortez to voters: Tell McConnell 'he is playing with fire' with Ginsburg's seat Lawmakers fear voter backlash over failure to reach COVID-19 relief deal Why Democrats must confront extreme left wing incitement to violence MORE (D-N.Y.), Ilhan Omar Ilhan OmarDemocrats scramble on COVID-19 relief amid division, Trump surprise Larry Kudlow defends response to coronavirus: Trump 'led wisely' The Hill's Morning Report - Sponsored by National Industries for the Blind - Woodward book revelations rock Washington MORE (D-Minn.) and Rashida Tlaib Rashida Harbi TlaibGeorge Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge The Democratic Party platform represents our big tent MORE (D-Mich.), all of whom endorsed his campaign for president which ended last week.

"Today I am asking you to support some extraordinary congresswomen — and important leaders of our movement — to ensure they can continue fighting for our values in Congress," Sanders wrote.

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The fourth member of "the Squad," Rep. Ayanna Pressley Ayanna PressleySan Francisco considers changing local voting age to 16 Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections 'Markeyverse' of online fans helps take down a Kennedy MORE (D-Mass.), is not facing a Republican challenger this fall and has no challengers in the Democratic primary for the district as well. Pressley was the only member of the group of four freshmen progressives to endorse Sen. Elizabeth Warren Elizabeth WarrenGOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (D-Mass.), who also ended her own bid for the Democratic nomination.

Tlaib is facing a competitive primary challenge from Brenda Jones, the Detroit City Council president who was narrowly defeated by Tlaib in a primary for the seat in 2018. Ocasio-Cortez and Omar are also facing several primary challengers as well as a number of Republicans vying for their party's respective primaries.

"Let me be very clear: If we are serious about building a political revolution — and continuing our fight for economic justice, social justice, racial justice, and environmental justice — we need people like Alexandria, Ilhan and Rashida representing our progressive values in Congress," Sanders wrote.