EXCLUSIVE — Rep. Nancy Mace’s (R-SC) Democratic 2024 challenger is looking to push the South Carolina Republican into making an endorsement in the Republican presidential primary, prompting her to choose between former U.S. Ambassador to the United Nations Nikki Haley and former President Donald Trump.

Michael B. Moore, a Democrat, is taking aim at Mace in a Wednesday press release, asking why the Republican incumbent has yet to endorse in the Republican primary.

“Now that Republicans have finished their first nominating contest in Iowa, I have a simple question for Nancy Mace: Do you support Donald Trump’s or Nikki Haley’s campaign for president?” he asked in the release.

The South Carolina Republican’s district is considered “likely Republican,” according to the Cook Political Report.

Mace has managed to establish herself as an unpredictable member of the Republican conference, joining seven other Republicans to oust former Speaker Kevin McCarthy last year despite her more centrist views. She has also made herself a frequent fixture in national media, raising her name identification across the country.

But the congresswoman hasn’t moved to endorse in the 2024 race despite her relationship with fellow South Carolinian Haley, who endorsed her for reelection to Congress in 2022.

She has also hinted at endorsing Trump, claiming last year, “We can’t afford four more years of Joe Biden.”

“I’m willing to bury the hatchet to save the country, and I know President Trump is, too,” she said, referencing her past feud with the former president.

Moore called it “curious” that Mace wouldn’t endorse Haley after proclaiming that it was time for a woman to be in the White House. He also noted Haley is a resident of Mace’s district and that her endorsement could boost Haley going into the race.

“We already know why Mace won’t endorse Haley before the South Carolina primary,” Moore said. “She wants to hedge her bets, as usual, and wait to see which way the political winds blow.”

He slammed his 2024 opponent as “noncommittal” for her refusal to make a choice, comparing it to her stance on abortion rights.

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“Nancy Mace should try something new and tell voters where she really stands” before the South Carolina primary on Feb. 24, according to Moore.

Mace’s campaign could not be reached for comment by the Washington Examiner.