Progressive Rep. Ayanna Pressley Ayanna PressleyEnding the Hyde Amendment is no longer on the backburner Fauci, 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?' MORE (D-Mass.) on Tuesday threw her support behind Jessica Cisneros's primary challenge to Texas Rep. Henry Cuellar (D).

The congresswoman praised Cisneros's work as a human rights attorney, saying the progressive primary challenger would bring "bold advocacy and tireless activism" if elected to the House.

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“Our country is at a crossroads, and as the Administration in Washington, D.C., continues to advance hateful, draconian policies targeting women, immigrants, and other marginalized communities, the experience and determination of candidates like Jessica Cisneros is more essential than ever,” Pressley said in a statement released by Cisneros's campaign.

Pressley's announcement follows progressive firebrand and fellow "squad" member Rep. 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's (D-N.Y.) endorsement of Cisneros last week.

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.), who is running for president, has also voiced her support for Cisneros.

Justice Democrats, the progressive advocacy group that helped Ocasio-Cortez and Pressley successfully run primary campaigns during the 2018 midterms, endorsed Cisneros after she launched her primary challenge in June.

The group has made targeting Cuellar, who has been in Congress since 2005, a top priority.

Cuellar’s campaign spokesman, Colin Strother, told The Hill that the campaign was not focused on Pressley's endorsement.

"Our opponent remains focused on endorsements from out of state PACs and politicians, while we remain focused on the voters of South Texas," Strother said in a statement. "This isn't the Bronx and it isn't Boston, this is the border. We power the nation's economy with international trade and oil gas exploration, but our socialist opponent and her out of state backers want to kill those jobs. Henry Cuellar it's fighting to protect those jobs and that will be our message to the voters."