U.S. Sen. John Cornyn says the president of the United States is afflicted with a “Twitter habit.”

Still, Cornyn gives Donald J. Trump a B+ in foreign policy.

I suppose Sen. Cornyn’s Republican credentials just cannot allow him to say the obvious thing: Mr. President, you need to rid yourself of that Twitter habit, immediately!

Cornyn was interviewed by WFAA-TV in Dallas and acknowledged that the president’s habit of firing off tweets — and then have them stand as presidential policy statements — has caused him some difficulty.

Then he saluted Trump’s action against Syria and suggested the president is dealing with Russia and its president, Vladimir Putin. Thus, he gets the good foreign-policy grade.

I suppose he chose to ignore the tension between Trump and fellow NATO allies, or perhaps the G7 meeting during which he tweeted that Germany is selling “too many cars” to Americans and how that must stop.

Hey, how about the confrontations the president has initiated with the leaders of Canada, Mexico, Australia, the United Kingdom and France?

I don’t think I’d give the president anywhere near a B+.

He also needs to kick the “Twitter habit.” If only his so-called Republicans “friends” had the guts to mention it out loud. The president damn sure doesn’t listen to his critics.