Donald Trump Donald John TrumpREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails Trump urges North Korea to denuclearize ahead of summit Venezuela's Maduro says he fears 'bad' people around Trump MORE labeled Democratic presidential hopeful Bernie Sanders Bernard (Bernie) SandersSenate Dems seek to turn tables on GOP in climate change fight Bernie Sanders Town Hall finishes third in cable news race, draws 1.4 million viewers Woman to undecided Biden: 'Just say yes' to 2020 bid MORE as "Crazy Bernie" on Wednesday while predicting Hillary Clinton Hillary Diane Rodham ClintonREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails County GOP in Minnesota shares image comparing Sanders to Hitler Holder: 'Time to make the Electoral College a vestige of the past' MORE will be the eventual Democratic nominee.

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While touting his own wins in West Virginia and Nebraska the previous night, where he faced no challengers, Trump, the presumptive Republican presidential nominee, argued he'd fair well against Clinton.

"I don't want to hit Crazy Bernie Sanders too hard yet because I love watching what he is doing to Crooked Hillary. His time will come!" Trump tweeted.

I don't want to hit Crazy Bernie Sanders too hard yet because I love watching what he is doing to Crooked Hillary. His time will come! — Donald J. Trump (@realDonaldTrump) May 11, 2016

Trump reiterated the "Crazy Bernie" moniker during an interview Wednesday morning on "Fox and Friends," going after the self-described democratic socialist, whose criticism of Clinton's "bad judgment" Trump has coopted.

"I call him 'Crazy Bernie' because he's not very good," Trump said. "Who's going to run against a socialist and lose?"

Sanders picked up a win in the West Virginia primary Tuesday over Clinton. The victory does little to close the delegate gap, however, but delays Clinton's attempt to lock up the Democratic nomination.

"Everything really about Hillary is rigged. She looks like she'll be able to run," Trump said, referring to the federal probe into her email arrangement that appears to be coming to a close.