Story highlights Christie dismisses jokes about his demeanor at Trump's Super Tuesday press conference

Christie says he endorsed Trump because he is "best person" to beat Hillary Clinton; doesn't regret it

(CNN) Chris Christie on Thursday insisted the lengthy blank stare he wore throughout Donald Trump's Super Tuesday press conference was symbolic only of the fact he was listening intently to the billionaire's speech.

"No, I wasn't being held hostage. No, I wasn't sitting up there thinking, 'Oh, my God, what have I done?'" the New Jersey governor told reporters in Trenton.

"It wasn't the kind of circumstance where I'd be jumping up and down, cheering and smiling," Christie said. "(Trump) was answering questions from the national press corps and I was listening."

The video of Christie taking in Trump's remarks drew laughter and some derision across social media, where the hashtag #FreeChrisChristie took flight, along with suggestions that the governor had come to regret his decision to back the GOP front-runner.

"All these armchair psychiatrists should give it a break," Christie said on Thursday. "I was standing up there, supporting the person who I believe is the best person to beat Hillary Clinton of the remaining Republican candidates. It's why I endorsed him."

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