Christie Says in a New Ad That He Was Wrong to Support Trump in 2016

Former Gov. Chris Christie of New Jersey said in a new ad released Thursday that he had been wrong to endorse Donald J. Trump in 2016.

“I have an admission to make,” Mr. Christie said directly to the camera in the 60-second ad, part of a series his campaign is running in New Hampshire, where he has staked his campaign on a strong showing. “Eight years ago, when I decided to endorse Donald Trump for president, I did it because he was winning, and I did it because I thought I could make him a better candidate and a better president. Well, I was wrong. I made a mistake.”

Mr. Christie endorsed Mr. Trump in 2016 after ending his own presidential campaign, and he went on to be a powerful surrogate. His campaign argues that, while several Republicans who previously supported Mr. Trump are now running against him for the party’s nomination, Mr. Christie is the only one willing to say he erred by supporting Mr. Trump in the first place. He suggested in the ad that this was evidence of his “character.”

“Now, we’re confronted with the very same choice again,” he said in the ad, which was first reported by Axios. “Donald Trump is ahead in the polls, so everyone says, ‘Anyone who’s behind him should drop out, and we should make our choice Donald Trump versus Joe Biden.’ Well, Joe Biden has had the wrong policies, and Donald Trump would sell the soul of this country. Neither choice is acceptable to me, and it shouldn’t be acceptable to you.”

Over the past few weeks, an increasing number of Republicans — most prominently Gov. Chris Sununu of New Hampshire — have called on Mr. Christie to end his campaign. Their argument is not for a rematch between Mr. Trump and Mr. Biden, but rather for narrowing the field of Mr. Trump’s primary opponents