President Trump had international affairs on his mind Tuesday morning. In his speech before the United Nations, he threatened to “totally destroy North Korea.” He lambasted the Iran nuclear deal. And he proclaimed that parts of the world “are going to hell.”

But by late Tuesday night, Mr. Trump was focused on other things. He pulled out his iPhone to deliver a 139-character tweet for world consumption:

“I was saddened to see how bad the ratings were on the Emmys last night — the worst ever,” Mr. Trump began.