Donald Trump has denied he mocked a reporter with a disability in a speech, despite appearing to imitate mannerisms of the "poor guy" and make fun of him.
The Republican presidential candidate said he does not know the reporter personally or what he looks like and was only mocking his journalism.
Mr Trump said New York Times reporter Serge Kovaleski "should stop using his disability to grandstand".
Mr Kovaleski has a congenital condition that affects joint movement.
In a speech on Tuesday in South Carolina, Mr Trump said: "Poor guy, you oughta see this guy." He then gestured in a jerky fashion as if imitating Mr Kovaleski's movements.
Mr Trump was challenging recollections by Mr Kovaleski and many others about the aftermath of the 9/11 terror attacks on New York.
Mr Trump has made unsubstantiated claims that thousands of Muslims in New Jersey were seen celebrating the attacks.
n 2001, Mr Kovaleski, then with The Washington Post, and another Post journalist wrote a week after the 9/11 attacks about authorities in New Jersey detaining and questioning "a number of people who were allegedly seen celebrating the attacks".
The story did not suggest "thousands" were celebrating, as Mr Trump claimed, and a story then published by The Star-Ledger in Newark, New Jersey, said the reports of such celebrations by Muslims proved unfounded.
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