GOP presidential front-runner Donald TrumpDonald John TrumpHouse Democrat slams Donald Trump Jr. for ‘serious case of amnesia’ after testimony Skier Lindsey Vonn: I don’t want to represent Trump at Olympics Poll: 4 in 10 Republicans think senior Trump advisers had improper dealings with Russia MORE is doubling down on his attacks against former President Bill ClintonWilliam (Bill) Jefferson ClintonMueller’s probe doesn't end with a bang, but with a whimper Mark Mellman: History’s judgment Congress should massively ramp up funding for the NIH MORE, saying he hurt Hillary ClintonHillary Diane Rodham ClintonGrassley blasts Democrats over unwillingness to probe Clinton GOP lawmakers cite new allegations of political bias in FBI Top intel Dem: Trump Jr. refused to answer questions about Trump Tower discussions with father MORE’s chances against then-Sen. Barack Obama (D-Ill.) seven years ago.

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“He was not very good for her,” Trump told host Savannah Guthrie Tuesday on NBC’s “Today." "He did very, very poorly. He failed in 2008 — he failed really badly. He frankly did a very poor job in campaigning.”

Trump was disputing the notion that Bill Clinton would boost his wife’s second White House bid this election cycle. Reports emerged Monday that the former president is stumping for his wife in the early voting state of New Hampshire next year.

Trump claimed that it is also open season on Bill Clinton’s legacy should he reenter the public eye for his wife.

“If he’s going to be out there campaigning, he’s certainly fair game,” he said. "I think just about everybody agrees with me on that.”

The outspoken billionaire added he is not holding back from discussing the former president’s extramarital indiscretions, real or imagined.

“Is that alleged?” he asked Guthrie when she used the term while discussing Bill Clinton’s affair with then-White House intern Monica Lewinsky. "I don’t think that’s alleged. If he’s admitted to it, you don’t have to use the word 'alleged.'”

Trump had escalated his attacks on the Clintons Monday by accusing Bill Clinton of having a “terrible record of women abuse."

Hillary Clinton, meanwhile, criticized the real estate tycoon of his own “penchant for sexism” last week.

Trump raised eyebrows earlier this month by suggesting that the former first lady "got schlonged" by Obama during the 2008 Democratic presidential primary.