Former New Jersey Gov. Chris Christie stepped up his direct attacks on Donald Trump from the debate stage, speaking directly to camera.
Asked about law and order, the former New Jersey governor drew attention to the fact Trump wasn't on stage. He turned directly to the camera, saying, "Donald, I know you are watching. You can't help yourself."
Continuing to speak directly to an absent Trump, Christie said the former president isn't skipping the debate because of his poll numbers or criminal indictments.
"You're not here tonight because you are afraid of being on the stage and defending your record," he said.
"If you keep doing that, no one up here is going to call you Donald Trump anymore. They will call you Donald Duck," he added, floating a new moniker for the former president, who is known for giving his rivals nicknames.
Shortly after the moment, Christie tweeted out a cartoon image of Donald Duck giving a thumbs up and winking.