At an event one day before the state's first-in-the-nation primary, Trump told an attendee he "would certainly return it if you think it is appropriate," as reported by The Hill.

"I would return it. Don't be so angry, I don't even know who he is," Trump also said.

The Hill reported the donation in question was from William Daniel Johnson, a corporate lawyer the Southern Poverty Law Center calls "an uninspiring but determined white separatist" who once railed against "Harry Potter kissing a Chinese girl" in a movie commercial.

FEC records show a man named William Johnson, employed by the Johnson & Associates law firm in Los Angeles, donated $250 to Trump's campaign in September 2015.

Johnson, chairman of the white nationalist American Freedom Party, has told TPM Trump's candidacy is a positive step toward America becoming a white ethno-state and for destroying the "middle-of-the-road Republican mindset."