Trump did it anyway, for reasons that remain mysterious to some of his subordinates. The trigger was a Dec. 14 phone call from President Recep Tayyip Erdogan of Turkey. Trump had been briefed to warn the Turkish leader not to invade Syria, as he had been threatening to do. But Trump instead told Erdogan: “You know what? It’s yours. I’m leaving.”

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Trump’s idea was to let Turkish forces take over the U.S.-backed campaign against the Islamic State in northeastern Syria. But senior military officials say the Turkish alternative doesn’t add up, quite literally, in terms of numbers.

The Turks want to replace a Kurdish-led force of about 60,000 fighters, known as the Syrian Democratic Forces. They have also claimed to U.S. officials that they have 50,000 Syrian opposition forces under their control, but that is wildly overstated. The Turkish-backed opposition is closer to 5,000, U.S. officials say, and many have extremist connections.

The Turks have been trying to sell the notion that they can combat the Islamic State for more than two years. U.S. military commanders who investigated Ankara’s proposals starting in 2016 began describing the force that would supposedly clear Raqqa and other extremist strongholds as a “ghost brigade.”

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The posturing continues: Last week, Turkish-backed Syrians moved heavy weapons across the border toward Manbij to signal their readiness. But Turkish military resources are so threadbare that they’ve asked the United States to provide overhead surveillance, logistical support and air cover for any operation to finish off the Islamic State in the Middle Euphrates River valley, officials say. The United States has, so far, refused such requests.

The most dangerous consequence of Trump’s Turkish solution is that it could reignite the Islamic State. The problem begins with about 780 foreign fighters who are now being held by the SDF in a half-dozen prisons in northeastern Syria. The SDF commander, Gen. Mazloum Abdi, told me bluntly in an interview last month that he wouldn’t be able to hold the prisoners if Turkish forces invaded the areas under his control.

These Islamic extremist prisoners are considered the worst of the worst, and their release could mean mayhem. But, so far, almost none of the 48 countries from which the fighters traveled to Syria has been willing to take them back. Britain, France, Belgium and other European nations that have previously been attacked are said to have refused, either claiming they don’t have legal authority or making other excuses. Macedonia has agreed to take a handful, as has Lebanon. Several North African nations are considering repatriation requests, and a Central Asian country might eventually take as many as 100.

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Trump’s apparent assumption, initially, that Turkey would take the prisoners could be almost as dangerous as letting them go free. The Turks have allowed extremist fighters to crisscross their border since the Syrian civil war began in 2011, U.S. officials say. These officials argue that Erdogan’s real nemesis in Syria is the Kurdish militia, which he calls a terrorist organization, rather than the extremists.

Erdogan has many links with the Trump team. Michael Flynn was a well-paid but unregistered Turkish lobbyist before he briefly became Trump’s national security adviser. Rudolph W. Giuliani, Trump’s personal lawyer, tried in 2017 to broker a deal to free Reza Zarrab, a Turkish-Iranian businessman with links to Erdogan’s family. Trump himself has embraced Erdogan as a kindred spirit when they’ve met at summits.

Amid all this policy turmoil, the Kurds just keep fighting the Islamic State. A U.S. official told me Thursday that the SDF had suffered 80 casualties — including 25 dead — in heavy fighting by its 5,000 fighters over the previous 72 hours. It had also pushed to within 15 miles of the Iraqi border. A brief ray of hope for the Kurds is that Trump has agreed to carry out the withdrawal of U.S. Special Operations forces from Syria over the next four months, and Turkey has pledged that it won’t attack until the SDF’s American advisers leave.

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The Kurdish fighters “do what they promise to do,” said one U.S. official who has worked closely with them. The same, alas, cannot be said of the Trump administration.

Twitter: @IgnatiusPost