Donald J. Trump is at it again. A lawmaker criticizes him and his followers and he responds with … insults.

The target is a familiar one: U.S. Rep. Maxine Waters, a Democrat from California.

Waters flew off the rails over the weekend with a rant that called for harassing Trump administration officials, even when they are trying to enjoy an outing with their families. White House press aide Sarah Huckabee Sanders, for instance, was asked to leave a Lexington, Va., restaurant by the owner who polled her employees.

Trump’s response was to refer to Waters as “low IQ Maxine.” He warned her to “be careful what you wish for, Max.”

Hey, Waters was wrong to blurt out that ridiculous rant. Trump, though, cannot find it within himself to keep the discussion civil and dignified. He has returned to the insult gambit that plays oh, so well with his political base.

Donald Trump isn’t acting very “presidented.”