Republican presidential front-runner Donald Trump is continuing his attacks against former President Bill Clinton, saying he was a detriment to Hillary Clinton's campaign in the 2008 Democratic primary season against Barack Obama.

"He was not very good for her,” Trump told Savannah Guthrie, host of NBC's Today show. "He did very, very poorly. He failed in 2008 - he failed really badly. He frankly did a very poor job in campaigning."

The two sides have continued their war of words over the last week, sparked by Trump saying Clinton got "schlonged" in the 2008 election. Trump's choice of words ignited a back-and-forth over the comments that were largely deemed sexist in nature, during which Clinton said Trump has a "penchant for sexism."

In the interview on Tuesday, Trump said Bill Clinton was "fair game" for attacks. "If he’s going to be out there campaigning, he’s certainly fair game," he said, according to The Hill. "I think just about everybody agrees with me on that."

For Trump, that includes targeting the former president's affairs and misconduct.

"There was certainly a lot of abuse of women,'' Trump said, Politico reported. "You look at whether it's Monica Lewinsky or Paula Jones or many of them. That certainly will be fair game. Certainly if they play the woman's card with respect to me, that will be fair game."

The Clinton team said on Monday that Democratic front-runner will stand up to what they characterized as bullying. 

"Though Donald Trump has pushed around nearly all of his fellow Republicans, Hillary Clinton won't be bullied or distracted by attacks he throws at her and former President Clinton," Clinton campaign spokeswoman Christina Reynolds told NBC News on Monday. "But when his insults are directed at women, immigrants, Asian-Americans, Muslims, the disabled, or hard working Americans looking to raise their wages - Hillary Clinton will stand up to him, as she has from the beginning. Donald Trump's words are demeaning, his policies are just as destructive."