Former New Jersey Gov. Chris Christie isn’t letting go of his nickname for former President Donald Trump — Donald Duck — for ducking the second GOP debate.

The Republican presidential candidate said Mr. Trump “knows what I said is true.”

“That’s why he spent most of his time last night in the debate reacting to the stuff I said and attacking me,” he said on Fox News on Thursday. “I live in his head.”

During the debate, Mr. Trump’s allies on social media repeatedly took jabs at Mr. Christie for being overweight. Mr. Trump later posted a doctored photograph depicting Mr. Christie filling up a plate at a massive buffet.

Mr. Trump said he wasn’t impressed by the new nickname.

He told Fox News after the debate that “anybody that would come up with that nickname shouldn’t be running for president.”

At the debate, Mr. Christie said Mr. Trump should be on the debate stage with the seven other candidate hopefuls but was afraid of “being on the stage and defending [his] record.”

• Mallory Wilson can be reached at mwilson@washingtontimes.com.