Jean-Marie Le Pen
Jean-Marie Le PenReuters

Republican Presidential frontrunner Donald Trump has received two high-profile endorsement from prominent anti-Semites over the weekend.

On Friday, leading American White Supremacist David Duke - a former leader of the Ku Klux Klan - announced his support for Trump, warning supporters against supporting any other candidates.

"Voting for these people, voting against Donald Trump at this point, is really treason to your heritage, he said on the David Duke Radio Program.

"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 added.

He also urged listeners to volunteer for the Trump campaign.

"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.

"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," Duke said.

Since then, the former KKK grand wizard has interspersed his obsessively anti-Jewish Twitter feed with messages of support for Trump.

Duke's "endorsement" late last week threatened to overshadow more high-profile endorsements, including that of former GOP candidate Chris Christie.

During a New Jersey event announcing Christie's support, Trump responded to the news of Duke's endorsement by telling a press conference he "disavowed" it.

"David Duke endorsed me? OK, alright. I disavow, OK?" Trump said, according to The Hill.

But just as that controversy began to die down Trump received a second endorsement from a far-right figure - albeit in this case one who is not an American voter.

On Saturday Jean-Marie Le Pen, who founded the far-right National Front party in France, tweeted his support for Trump.

"If I were American, I would vote Donald Trump," Le Pen tweeted in French. "But may God protect him!"

Le Pen - who was expelled from the National Front after feuding with his daughter and current party leader over her attempts to steer it away from its anti-Semitic origins - has been charged in court for downplaying or denying the holocaust, and has regularly hit headlines for his anti-Semitic statements.

Trump has not yet responded to Le Pen's comments.