(CNN) Donald Trump said "there's nobody that's done so much for equality as I have" and unequivocally renounced the support of white supremacists on Tuesday.

Trump's remarks came in an interview on ABC's "Good Morning America," days after his apparent failure to disavow former Klu Klux Klan leader David Duke in an interview Sunday with CNN's Jake Tapper.

Asked by host George Stephanopoulos if he was "prepared to make a clear and unequivocal statement renouncing the support of all white supremacists," the Republican front-runner sought to put the issue to bed.

"Of course I am, of course I am," Trump said.

Trump dismissed concerns over his muddled response in the CNN interview, saying, "David Duke and all were disavowed, I disavowed them on Friday."

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