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Harvard Law Professor and longtime Democrat Alan Dershowitz said he would not have campaigned for then-Sen. Barack Obama (D-Ill.) if he knew about the future president's photo op with Louis Farrakhan.

Farrakhan, leader of the Nation of Islam, is a "virulent anti-Semite and anti-American," Dershowitz said on "Fox & Friends."

"He has called Judaism a gutter religion. He is a horrible, horrible human being," he said.

A photographer, Askia Muhammad, showed Fox News' Tucker Carlson a 2005 picture of Obama and Farrakhan smiling together.

He said that afterward, the Congressional Black Caucus contacted him and demanded to have the photo back.

“I gave the original disk to him and in a sense swore myself to secrecy because I had quietly made a copy for myself,” Muhammad said.

Muhammad said he thought the CBC was concerned a photo with Farrakhan could hurt the young senator's future presidential aspirations.

Muhammad added that Obama had Nation of Islam followers working in his Chicago senate office.

Dershowitz said he threatened to leave the Democratic Party if Rep. Keith Ellison (D-Minn.) - who once had connections with Farrakhan - was elected chairman instead of Tom Perez.

"We should have nobody in public office associating with a bigot like Farrakhan," he said.

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