Presidential candidate and Fox News favorite Donald Trump continues to spark Fox-on-Fox violence, with Fox News personality Geraldo Rivera on Thursday threatening to kick the "racist ass" of Trump adviser and Fox News contributor Roger Stone.

It started after Stone, a former Nixon operative and relentless provacatuer, called Ana Navarro and Roland Martin "quota hires" by CNN, implying that the Hispanic commentator and black pundit owed their positions to affirmative action.

Rivera weighed in, and from there it got messy.

"@ananavarro & @rolandmartin have twice the intellect and integrity of @RogerStone. @realDonaldTrump doesn't need thugs like him," Rivera tweeted Wednesday.

Stone shot back: "@GeraldoRivera is an embarrassing hack fired by FOX for his lack of ratings. Ailes kept him around long past any value. #Pathetic."

Rivera then delivered the coup de grace: "When I see you around Fox News I'm going to kick your racist ass punk."

Stone continued to fire off at Rivera, at one point hinting at a scandalous backstory to an infamous topless selfie that Rivera tweeted last year. What Stone knows about Rivera's vanity photos remains to be revealed.