David Duke is encouraging his listeners to vote for Republican presidential front-runner Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE.

Duke, a white nationalist and former Ku Klux Klan grand wizard, called Trump's victories in Nevada and South Carolina a "historic day," on the "David Duke Radio Program" Wednesday, according to Buzzfeed News.

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He said voting for Trump's rivals, including Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE and Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE, is "really treason to your heritage," calling the Republican establishment "your enemy."

“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,” Duke said.

He called Trump's candidacy an "insurgency that is waking up millions of Americans," and touted the front-running billionaire's policies, including his immigration plans, and told his listeners it's their job to "get active" and volunteer for Trump.

"Get off your duff. Get off your rear end that’s getting fatter and fatter for many of you every day 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 mindset that you have."