Donald John Trump continues to send astonishingly conflicting messages.

Back when he was running for president of the United States, Trump said he opposed sending U.S. troops into “useless” wars. He cited the Iraq War as Example No. 1 of a war that wasn’t worth the fight. I happen to agree with him.

Now here he is, two-plus years into his term and the president is threatening to go to war with Iran. What the hell?

Why is that? Iranian-backed Yemeni forces have been launching rocket attacks against Saudi shipping. They are threatening the flow of oil out of the region. Trump says Iran’s continuing provocation could prompt a devastating response from this country.

We have sent the USS Abraham Lincoln battle group into the Persian Gulf. We’re flexing our muscles. We’re telling the Iranians: Don’t mess up, here, or else you’re going to pay too drastic a price.

Trump made the correct call to end our involvement in these wars with no end. Now, though, he has surrounded himself with a cabal of uber-hawks — led by national security adviser John Bolton — who seem hell bent on going to war with the intention of overthrowing the ayatollahs who run the Islamic Republic of Iran.

I am not prone to insist that Trump rely on his own instincts, but on this matter, he should do exactly that.

However, Trump also says Iran shouldn’t have nuclear weapons. But wait! We had that treaty that aimed to end Iran’s nuclear development; then the president pulled us out. But . . . there are reports from other nations still involved in the agreement that suggest that Iran is actually complying with the conditions set forth by then-President Obama and then-Secretary of State John Kerry.

I’m baffled. Confused. Bumfuzzled.

Listen to that wiser angel whispering in your ear, Mr. President.