Rep. 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.), one of the most prominent progressives in the House, will join presidential candidate Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) at a rally in Detroit this weekend, Sanders’ presidential campaign announced Tuesday.

The Sanders campaign said the two lawmakers will be joined Sunday “by local leaders and activists fighting for economic, environmental and racial justice, and against the corporate assault on working families across America.”

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Tlaib, a member of the group of four progressive freshman lawmakers known as “the squad,” is anticipated to announce her endorsement for Sanders as the Vermont senator seeks to fortify his left flank against a surging Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.). 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.) and Ilhan Omar Ilhan OmarOmar urges Democrats to focus on nonvoters over 'disaffected Trump voters' Omar 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?' MORE (D-Minn.), two other “squad” members, have already endorsed Sanders.

“Proud to endorse @SenSanders for President, glad that @AOC and @RashidaTlaib are on board too. It’s time,” Omar tweeted last week.

Tlaib’s office did not immediately respond to a request for comment from The Hill as to whether she intends to announce her endorsement at Sunday’s rally.

The appearance with Tlaib shortly after last weekend’s New York City rally with Ocasio-Cortez could help give Sanders a shot in the arm as sliding poll numbers and a heart attack spark questions about his campaign’s viability. Warren has also worked to take a bite out of Sanders's progressive support in recent months, surging in the polls while rolling out similar proposals with in-depth explanations.

Sanders’ campaign used the rally with Ocasio-Cortez to try to put those concerns to bed and reenergize his supporters.

"I'm here to tell you Bernie's back," Sanders’ wife, Jane, said at the start of the rally. "He's healthy. He's more than ready to continue his lifelong struggle to fight for the working people of America."

"The only heart attack we should be talking about is the one Wall Street is going to have when Bernie Sanders is president of the United States," liberal filmmaker Michael Moore added.

Despite the campaign’s recent hiccups, Sanders still polls in the top three of most national and statewide surveys and remains a fundraising juggernaut, raising $25.3 million in the third quarter of 2019, the most of any candidate.