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 Marie Newman in her primary challenge to Rep. Daniel Lipinski Daniel William LipinskiFive things we learned from this year's primaries Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Bottom line MORE (D-Ill.).

"At a time when our reproductive rights are under attack, Illinois deserves a leader with an unwavering commitment to fighting for reproductive health care," she tweeted, referencing Lipinski's opposition to abortion.

"I'm proud to endorse @Marie4Congress. She understands this isn’t a moment to back down—it’s time to fight back," Warren added.

At a time when our reproductive rights are under attack, Illinois deserves a leader with an unwavering commitment to fighting for reproductive health care. I'm proud to endorse @Marie4Congress. She understands this isn’t a moment to back down—it’s time to fight back. https://t.co/xXXVPOY3Ue — Elizabeth Warren (@ewarren) September 9, 2019

Newman tweeted Monday that she was "honored" to receive Warren's endorsement.

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"We need a real leader in #IL03—and in the White House—who will put workers, our climate, and the health of our people above everything else," she added.

Honored to receive the endorsement of @ewarren who's dedicated her career to fighting for workers and working families. We need a real leader in #IL03—and in the White House—who will put workers, our climate, and the health of our people above everything else. #NewDayInIL03 https://t.co/DEqZWz4oLT — Marie Newman (@Marie4Congress) September 9, 2019

On Monday Warren also endorsed Jessica Cisneros, a primary challenger to Rep. Henry Cuellar (D-Texas), who also opposes abortion.

The Democratic Congressional Campaign Committee made headlines and sparked ire from some progressives for backing Lipinski's reelection bid. The group in March warned possible campaign vendors that the party wouldn't give contracts to firms doing work for primary challengers.