Donald Trump appeared to confuse Nikki Haley for Nancy Pelosi during a rally speech.
Haley said the gaffe raises questions about whether Trump is "mentally fit" for office.
The pair have ramped up attacks on each other ahead of the New Hampshire primary on Tuesday.
Republican presidential candidate Nikki Haley questioned whether Trump was "mentally fit" to serve as president after he confused her with Nancy Pelosi in a bizarre rally speech.
"We see that Biden has changed so much in two years," Haley said at a rally in Keene, New Hampshire on Saturday.
"But last night, Trump is at a rally, and he's going on and on mentioning me multiple times as to why I didn't take security during the Capitol riots. Why didn't I handle Jan. 6 better? I wasn't even in DC on Jan. 6. I wasn't in office then."
While speaking at a rally on Friday, Trump blamed Haley for security lapses on January 6, 2021, claiming she was "in charge" of security — a long-debunked allegation he has continuously made against then-Speaker of the House Pelosi.
"They're saying he got confused, that he was talking about something else, he's talking about Nancy Pelosi," Haley said.
"He mentioned me multiple times in that scenario. The concern I have is — I'm not saying anything derogatory — but when you're dealing with the pressures of the presidency, we can't have someone else that we question whether they're mentally fit to do this. We can't."
Trump's cognitive abilities have come into question in recent months as he has mixed up President Joe Biden and former President Barack Obama multiple times on the campaign trail.
Trump appeared to respond to questions about his mental fitness during a rally in New Hampshire on Saturday, claiming he mixes Biden and Obama up on purpose to suggest "Obama is running the show."
He repeated his regular claim that he had recently "aced" a cognitive test.
Both Trump and Haley appeared at rallies in New Hampshire on Saturday ahead of the primary in the state on January 23.
The pair have ramped up attacks against each other in recent weeks.
Haley is trailing Trump in state polls by a smaller margin than in other states, making it the most likely race for her to pull off an upset against the frontrunner.
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