"He not only threw me under his campaign bus, he backed up and ran over me again," Craig told NBC's Matt Lauer in an interview taped Sunday set to air later this week on the "Today" show.
Romney, former governor of Massachusetts, called Craig's behavior "disgraceful" and urged the senator to resign when news of the arrest broke in August.
Craig was Romney's Senate liaison before resigning from the campaign.
Romney spokesman Kevin Madden defended the presidential candidate's response. "Gov. Romney simply believes that a public office is a public trust," Madden said. "He believes when a public official enters a guilty plea, they have broken that public trust and should step aside for the sake of their constituents."
At least Craig didn't resign, change his mind, and storm over to the Romney campaign headquarters demanding his old job back.
This has been another installment of "Republicans Turning On Their Own When Their Hypocrisy Is Made Known." (Great rhyme scheme, methinks.)
Craig seems determined to prove himself a boil on the GOP backside. So far, he's doing a good job.