What did Donald Trump do today?

He got even more confused than usual about Iran.

Recently, Trump has given up on actually winning the war he's declared victory in countless times, and has shifted the goalposts to a new place: that the war will be over after the midterm elections.

Asked today to explain why he thought it would happen then—and not in the two months between now and then—Trump changed his mind again, saying that the United States might not disengage from Iran at all. "We'll ultimately get out (of Iran), unless we decide to stay and keep the oil like Venezuela," he said.

The United States is not "in Iran" and has no Iranian oil "to keep."

Changing that would mean invading Iran, a country roughly the size and population of the Eastern Time Zone of the United States, but with much more rugged terrain. Even critics of the ruling regime in Iran are vehemently anti-US, and that was before Trump urged them to overthrow their government and then, when that didn't happen, turned around and threatened to kill civilians like them.

Short of using nuclear weapons, it is all but inconceivable that a U.S. invasion of Iran would succeed. For a comparison, the United States never managed in almost 20 years of fighting in Afghanistan to control more than the capital city of Kabul and the immediate surrounding area.

Trump, who may have gotten confused and convinced himself that some of what happened in Venezuela had actually happened in Iran, did not elaborate on what he thought had happened in Iran. He did, however, say that it was all right for China to assist Iran in targeting attacks that killed American troops. This is not the first time that Trump has excused hostile countries for attacking or killing American troops: he also gave Russia a pass for similar help to Iran, as well as for offering bounties on American servicemembers during the war in Afghanistan.

Why does this matter?

• If you can't remember which war you're fighting or whether you've already won or lost, you're not cognitively fit to be president.
   
• Presidents are supposed to care who is trying to kill US troops during war.