In making a second run for the presidency, Mr. Christie, 60, has positioned himself as the person most willing to attack both Mr. Trump, his former friend turned adversary, and Gov. Ron DeSantis of Florida, who has been in second place in nearly every public Republican primary poll for months. Mr. Christie’s presence in the race could be unwelcome for Mr. DeSantis, for whom every additional candidate harms his ability to consolidate support.

Mr. Christie, who is set to announce his run at a town-hall-style event in New Hampshire Tuesday evening, has already begun laying out an aggressive case against Mr. Trump based on the former president’s policies — namely, that he made a number of promises that he never delivered. That case is one that other hopefuls have generally sidestepped, instead largely avoiding saying Mr. Trump’s name. By contrast, Mr. Christie has gone directly at him.

[Yeah, whatever. Christie seems under the impression that he represents a wide swath of the Republican primary voter base. That wasn’t true in 2015 when he ran the first time, and it’s even less true eight years later. Is he a smart guy? Sure, but no one in the field is a dummy. And if he tries to take on DeSantis over his record in Florida, DeSantis will eat him alive over Bridgegate and the somewhat fumbled response to Hurricane Sandy. — Ed]