Former New Jersey Gov. Chris Christie boasted to an audience in New Hampshire this week that unlike other potential 2024 presidential candidates, he is not afraid of standing up to ex-President Donald Trump. Christie, speaking at St Anselm College in Goffstown on Monday, burnished his credentials for opposing Trump by referring to his exchange with Sen. Marco Rubio during a presidential debate in February 2016, when he assailed the Florida Republican as an inexperienced politician. When Rubio stumbled over an answer and repeated himself twice, Christie said sarcastically, “There it is — the memorized 25-second speech.” Christie, who ended up...