New Jersey Gov. Chris Christie said he never promised the publisher of a prominent New Hampshire newspaper that he wouldn't endorse Donald Trump.

"Some of your supporters say you promised them you would not endorse Donald Trump," "This Week" host George Stephanopoulos told Christie during an interview Sunday. "Joe McQuaid, the publisher of the New Hampshire Union Leader, says you promised him on a phone call you wouldn't endorse Donald Trump."

"It's just not true," Christie replied. "He called me two days after the primary and said, 'I was just told that you're about to endorse Donald Trump.' And I said to him, 'that's absolutely untrue. I'm not about to endorse anybody.'"

"You didn't say you would never endorse him?" Stephanopoulos asked.

"No," Christie said, adding that he told McQuaid that it was too soon for him and his wife Mary Pat to choose a candidate to endorse.

Christie said he told McQuaid that "'it's two days after the primary. Mary Pat and I are just taking a deep breath. We haven't thought about what we're going to do next in this race.'"

Before the New Hampshire primary, the publisher and Trump got into a war of words. He once said Trump is like Biff Tannen, a villain in the popular "Back to the Future" movie series.

McQuaid endorsed Christie for president before the governor ended his campaign on Feb. 10.

After Christie announced he was getting behind Trump's candidacy, McQuaid told Politico that Christie promised him he "would never" endorse Trump.

McQuaid said he was disappointed in Christie and suspected the New Jersey governor of "being involved in the Lindbergh baby kidnapping."

"It's like Romney says about Trump and his taxes. I think there's something there. Christie hasn't come clean," McQuaid said.