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.) on Monday endorsed Jessica Cisneros, a Democratic primary challenger to Rep. Henry Cuellar (D-Texas).

“The people of Texas’ 28th district are ready for systematic change and deserve a Democrat that will be on the side of working people; not the side of big money and obstructionist Republicans,” Warren, a leading contender for the Democratic presidential nomination, said in a statement.

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"I believe Jessica Cisneros is that fighter. As an immigration lawyer and daughter of small business owners growing up on the border, Jessica knows our diversity is our strength and that when progressives are unapologetic about our values and who we’re in this battle for, we win. It’s time Texans had a champion in Congress who does just that. I’m proud to support Jessica.”

Cisneros launched her campaign in June and was immediately endorsed by Justice Democrats, the group that helped 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 (D-N.Y.) in her primary bid against 10-term incumbent Rep. Joseph Crowley (D-N.Y.).

The liberal advocacy group has made Cuellar a top target since January, bashing his voting record.

Cuellar responded with a tweet, saying, "We told you the outside special interests were coming to take away local jobs. Elizabeth Warren and our opponent share an agenda that would kill over 108,000 jobs in our region. I'm fighting back. Will you join me?"

We told you the outside special interests were coming to take away local jobs. Elizabeth Warren and our opponent share an agenda that would kill over 108,000 jobs in our region. I'm fighting back. Will you join me? — Rep. Henry Cuellar (@CuellarCampaign) September 9, 2019

Cuellar’s campaign manager Colin Strother also slammed Warren’s endorsement.

“Elizabeth Warren is at 10 percent in Texas and has as much of a chance of being elected president as our opponent does being elected to Congress,” Strother told The Hill.



He said that both Warren and Cisneros have “backward policies that would hurt Texas,” calling the Green New Deal a “scam” and saying that "Medicare For All" would cause Texans to lose coverage.



“I don’t think the district will get on board with this socialist agenda,” Strother said, before calling Warren and Cisneros 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.) "knockoffs."

Cuellar was one of three Democrats to side with Republicans on "Kate's law," a measure to expand maximum sentences for people who attempt to reenter the country after having been deported, and legislation to strip federal funding from “sanctuary” jurisdictions that do not fully cooperate with federal immigration authorities.

He also opposes abortion and has voted against allowing federal funds to be used for the practice.

Warren's endorsement of Cisneros comes despite a push by the Democratic Congressional Campaign Committee's (DCCC) to protect incumbents against primary challengers.

The group warned would-be campaign vendors in March that the party wouldn't award contracts to political firms working for primary challengers.

“I’m so proud to receive this endorsement from Senator Warren, who has dedicated her career to fixing our corrupt political system and fighting for working families like mine,” Cisneros said in a statement.

“Our district deserves to be represented by a true Democrat who will work in Washington to improve the lives of her constituents, not corporate donors. Senator Warren’s support demonstrates that we’re building the momentum we need to bring real change to South Texas.”

Texas's 28th Congressional District went for Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE by 20 points in the 2016 presidential election and is rated solidly Democratic by the nonpartisan Cook Political Report.

-- Updated at 1:53 p.m.