By his threats over the past few days to invade, annex or otherwise subjugate Canada, Panama and Greenland, president-elect Donald Trump is behaving like an utter jackass. Everybody knows it, but whether any of his outbursts on Tuesday should be taken seriously is something even his closest advisers don’t seem to know.

Much of Trump’s Tuesday press conference, convened at his garish Florida resort, Mar-a-Lago, consisted of the usual imbecilities.