David Duke, a white nationalist and former Klu Klux Klan grand wizard, told his audience Wednesday that voting for anyone besides Donald Trump “is really treason to your heritage.”

“Voting for these people, voting against Donald Trump at this point, is really treason to your heritage,” Duke said on the David Duke Radio Program. BuzzFeed News first reported the comments.

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"I’m not saying I endorse everything about Trump. In fact, I haven’t formally endorsed him. But I do support his candidacy, and I support voting for him as a strategic action. I hope he does everything we hope he will do.”

The former Louisiana representative told listeners to start volunteering for Trump.

“And I am telling you that it is your job now to get active. Get off your duff. Get off your rear end that’s getting fatter and fatter for many of you everyday on your chairs. When this show’s over, go out, call the Republican Party, but call Donald Trump’s headquarters, volunteer,” he said. “They’re screaming for volunteers. Go in there, you’re gonna meet people who are going to have the same kind of mind-set that you have.”

In December, Duke told POLITICO that Trump’s candidacy allows Americans to be more open about their racial animus.

“He’s made it OK to talk about these incredible concerns of European Americans today, because I think European Americans know they are the only group that can’t defend their own essential interests and their point of view,” Duke said. “He’s meant a lot for the human rights of European Americans.”