At one time, the world hoped that an Axis of Adults could constrain the juvenile in the Oval Office, but such naive expectations have been dashed repeatedly. Syria offers the latest example of the futility of expecting that lower-level officials can consistently save the world from the commander in chief.

In April, after U.S. troops had scored some gains against Islamic State, President Trump proclaimed, “I want to get out” of Syria. His aides were concerned that this would represent a betrayal of America’s Kurdish allies and a victory not only for the Islamic State but also for Russia and Iran. They managed to win a stay of sentence — just barely.

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In September, the administration grandly announced a new policy for Syria: Some 2,200 U.S. troops would remain in Syria indefinitely with a mission of containing Iran, not just defeating the Islamic State. “The new policy is we’re no longer pulling out by the end of the year,” said James Jeffrey, a veteran diplomat who was appointed Secretary of State Mike Pompeo’s “representative for Syria engagement.” Asked if Trump had signed off on this policy, Jeffrey said, “I am confident the president is on board with this.”

That was three months ago. Now Trump appears to be pulling out after all — unless the Defense Department can somehow win another last-second reprieve.

“We have defeated ISIS in Syria, my only reason for being there during the Trump Presidency,” Trump tweeted Wednesday morning in his “Mission Accomplished” moment. No serious person believes this. In fact, on Tuesday, a State Department spokesman, who clearly had no idea of the presidential announcement to come, told reporters: “U.S. forces are present in the campaign to ensure the enduring defeat of ISIS. We’ve made significant progress recently in the campaign, and — but the job is not yet done.”

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Indeed, it’s not. The United Nations reported in August that the Islamic State still has 20,000 to 30,000 fighters in Iraq and Syria. Acts of terrorism attributed to the Islamic State have picked up in “liberated” areas, and experts such as Hassan Hassan, co-author of the book “ISIS: Inside the Army of Terror” have been warning that the group is poised to make a comeback in Syria. We have seen the Islamic State pull off just such a resurrection in the past: Under its previous guise of al-Qaeda in Iraq, it had been all but defeated by 2011 when President Barack Obama ordered a pullout of U.S. troops from Iraq. Before long the terrorist group was stronger than ever, establishing a brutal caliphate sprawling across Syria and Iraq.

The risks of such a comeback now grow markedly. America’s Kurdish and Arab allies in the Syrian Democratic Forces will be hard-put to resist the group on their own, much less deal with the Turkish threat against the Kurds. The likely outcome is that they will partner with the genocidal Bashar al-Assad regime and its allies — Iran and Russia.

Earlier this year, Trump pulled out of the Iran nuclear deal on the grounds that it was too generous toward Tehran. But by withdrawing U.S. troops, who were in control of one-third of Syria, he is handing a Christmas present to the mullahs. So much for Trump’s conceit that he is the most pro-Israel president ever. A U.S. withdrawal from Syria will entrench the Islamic Republic of Iran on Israel’s doorstep. That damage vastly outweighs the empty symbolism of moving the U.S. Embassy to Jerusalem.

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Why would Trump do this now? Who knows? Given that he is acting at odds with his advisers, this is clearly not the result of a normal policy-review process. This is the Trump Doctrine in operation: Trump does whatever he wants. It could be based on what he had for breakfast — or there could be something more sinister going on.

The New York Times quotes “one Defense Department official” who “suggested that Mr. Trump . . . wants to divert attention away from the series of legal challenges confronting him over the recent days: the Russian investigation run by the special counsel as well as the sentencing of his former personal lawyer, Michael Cohen, in a hush-money scandal to buy the silence of two women who said they had affairs with Mr. Trump.” When presidents normally “wag the dog,” they start a war. Trump is unique in all sorts of ways, including that he may now be wagging the dog by ending U.S. involvement in a war that remains far from finished.