Conservative commentator Bill Kristol has dumped Donald Trump following the reality TV star's controversial remarks about the war record of Sen. John McCain, R-Ariz.

"[Trump's] dead to me," Kristol said this weekend, referring to the billionaire's recent suggestion that McCain is not a war hero just because he spent five years in captivity during the Vietnam War. "He was a controversial character who said some useful things, I think, who brought some people into the Republican tent. He jumped the shark yesterday," Kristol said of Trump.

Trump said in an interview Saturday that he is no fan of McCain, who has riled the businessman and his base by referring to them as "crazies." Trump said the Arizona senator and one-time GOP presidential candidate is a "loser."

The blustering 2016 candidate also said that McCain, who spent more than five years in captivity as a prisoner of war in Vietnam, his body broken repeatedly, is "not a war hero."

"He's a war hero because he was captured," Trump said. "I like people that weren't captured." Trump later said that "perhaps" McCain is a war hero.

Kristol has said some positive things about Trump's candidacy, including that Trump force the more serious candidates, including Sen. Marco Rubio, R-Fla., and Wisconsin Gov. Walker, to lay out their positions on issues like immigration. Kristol also said recently that Trump would make a better president than Democratic front-runner Hillary Clinton because he is "older, wiser, and richer."

Trump has since responded to the outcry over his remarks by telling ABC News' Martha Raddatz Sunday that he has no plans to apologize to the senator. He also accused McCain of doing "nothing" for the nation's veterans.

"I'm very disappointed in John McCain because the vets are horribly treated in this country," he said. "I'm fighting for the vets. I've done a lot for the vets."

Trump, a former reality TV star, also accused McCain of spending too much time on TV.

The Arizona senator, for his part, appears to be unfazed by the 2016 candidate's blustering, saying Monday that he is not offended by the remarks and that Trump doesn't owe him an apology.

"I think he may owe an apology to the families of those who have sacrificed in conflict and those who have undergone the prison experience in serving their country," McCain said Monday on MSNBC.

Kristol did not respond to the Washington Examiner's request for comment.