Nikki Haley, the former South Carolina governor and Trump primary challenger (center), is warning Republicans they should prepare for Democrats to replace President Biden with a candidate who is "younger" and more "vibrant." (Getty Images)
Haley said in May that despite their contentious primary contest in which both candidates threw personal insults at each other, she planned to vote for Trump in November.
She also told the Journal she had reached out to the former president recently and had a "good conversation."
Trump previously said he believes Haley will be "on our team in some form."
Haley previously served as Trump’s United Nations ambassador.
"America deserves the strongest leader possible," Haley said on X Saturday. "Thursday night was shocking. It's exactly why I have been calling for mental competency tests for anyone running for office. Joe Biden owes the American people transparency about his cognitive abilities."
She added that Washington, D.C. is "full of older people," and voters need to know "who is up to the challenge and who is not."
TOP HOLLYWOOD DONORS THREATEN TO STOP GIVING TO DEMS IF BIDEN NOT REPLACED AS CANDIDATE: REPORT
Haley said in May she plans to vote for Trump. (Mark Wilson/Getty Images)
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Haley, 52, told the Journal Democrats could suffer down-ballot losses if they keep Biden as the nominee.
"If they continue down this path, and they have Biden as their nominee, they are committed to hurting America," she said.
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