(CNN) - New Mexico Gov. Bill Richardson on Wednesday sharply disputed Bill Clinton's reported claim that Richardson promised not to endorse Barack Obama's bid for the White House.
"I never did," Richardson told CNN. "I never saw [President Clinton] five times. I saw him when he watched the Super Bowl with me. We made it very clear to him that he shouldn't expect an endorsement after that meeting."
Bill Clinton's comments reportedly came during a recent meeting with some California superdelegates. The San Francisco Chronicle reported the former president got "red faced" when the subject of Richardson came up and said, "Five times to my face (Richardson) said that he would never do that."
In the interview Wednesday, Richardson acknowledged he was "very close to endorsing" Clinton, but decided not to after the campaign got "nasty."
"I held back. I waited. I felt the campaign got nasty. I heard Senator Obama; he would talk to me continuously," Richardson said.
"The Clintons should get over this," he added.
Richardson, a former U.N. Ambassador and Energy Secretary in the Clinton administration, endorsed Obama late last month.
Read more: Richardson denies promise to Clintons
Related: Watch Bill Richardson's interview on The Situation Room.