Former U.S. Ambassador to the United Nations Nikki Haley Nimrata (Nikki) Haley'The soul' versus 'law and order' Author Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' GOP lobbyists pleasantly surprised by Republican convention MORE slammed former Vice President Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE (D) on Thursday after Biden appeared to suggest that Haley did not have the "brains" to expand Medicaid when she was governor of South Carolina.

Haley tweeted Thursday that she would "put my brain up against yours anytime," after a reporter for The Post and Courier in South Carolina tweeted that Biden had made the remark to attendees at a campaign event Thursday before catching himself and then claiming Haley did not have the "foresight" to expand Medicaid.

Hold up Joe. I will put my brain up against yours anytime. Bring it. #GodBlessJoe https://t.co/x5bfrVCrCa — Nikki Haley (@NikkiHaley) February 26, 2020

According to the Post and Courier reporter, Biden told supporters at the event that he stepped back from criticizing Haley's "brains" because he wanted to "be polite."

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Biden has started criticizing @NikkiHaley more directly in South Carolina recently for declining to expand Medicaid here.



In Georgetown, he appears to start saying she “didn’t have the brains” before stopping himself and changing it to “foresight” because he wants to “be polite” pic.twitter.com/xjT3Y2RL4H — Jamie Lovegrove (@jslovegrove) February 26, 2020

The Biden campaign did not immediately return a request for comment on the exchange.

Biden is campaigning in South Carolina ahead of the state's primary on Saturday, where he faces a crucial test. Biden is looking for his first primary victory of the 2020 season following damaging losses in Iowa, New Hampshire and Nevada.