The president used America’s military not against any real threat but as toy soldiers, with the intent of manipulating a domestic midterm election.

A week before the midterm elections, the president of the United States announced he would deploy up to 15,000 active duty military troops to the United States-Mexico border to confront a menacing caravan of refugees and asylum seekers. The soldiers would use force, if necessary, to prevent such an “invasion” of the United States.

Mr. Trump’s announcement and the deployment that followed (of roughly 5,900) were probably perfectly legal. But we are a bipartisan threesome with decades of experience in and with the Pentagon, and to us, this act creates a dangerous precedent. We fear this was lost in the public hand-wringing over the decision, so let us be clear: The president used America’s military forces not against any real threat but as toy soldiers, with the intent of manipulating a domestic midterm election outcome, an unprecedented use of the military by a sitting president.

The public debate focused on secondary issues. Is there truly a threat to American security from an unarmed group of tired refugees and asylum seekers on foot and a thousand miles from the border? Even the Army’s internal assessment did not find this a very credible threat.

Can the president deny in advance what could be legitimate claims for asylum, without scrutiny? Most likely, this violates treaty commitments the United States made as part of its agreement to refugee conventions in 1967, which it has followed for decades.

The deployment is not, in the context of the defense budget, an albatross. We are already paying the troops, wherever they’re deployed, and the actual incremental costs of sending them to the border might be $100 million to $200 million, a tiny fraction of the $716 billion defense budget.

Still, we can think of many ways to put the funds to better use, like improving readiness.

It’s also not unusual for a president to ask the troops to deploy to the border in support of border security operations. Presidents of both parties have sent troops to the border, to provide support functions like engineering, logistics, transportation and surveillance.

But those deployments have been generally in smaller numbers, usually the National Guard, and never to stop a caravan of refugees and asylum seekers.

So, generously, some aspects of the deployment are at least defensible. But one is not, and that aspect is the domestic political use — or rather, misuse — of the military.

James Mattis, the secretary of defense, asserted that the Defense Department does not “do stunts.” But this was a blatant political stunt. The president crossed a line — the military is supposed to stay out of domestic politics. As many senior military retirees have argued, the forces are not and should not be a political instrument. They are not toy soldiers to be moved around by political leaders but a neutral institution, politically speaking.

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