With his executive action suspending the admission of refugees to the United States and temporarily halting the entry of citizens from a variety of Muslim countries, President Donald Trump made a quick down payment on a key campaign promise. He also set the United States on a disastrous course—one that threatens to weaken our national security and diminish American global leadership.

The order signed on Friday calls for a temporary ban on visas for individuals from Iran, Iraq, Syria, Sudan, Libya, Yemen, and Somalia; a 120-day suspension of the resettlement of all refugees; and an indefinite ban on the resettlement of Syrian refugees.

It is hard to find any real basis for this action. During the campaign, Trump made frequent, unfounded claims that we have a “dysfunctional immigration system” and that unknown people are pouring through our borders. But over the past decade and a half, U.S. immigration enforcement has improved vastly to the point where it bears scant resemblance to the system whose vulnerabilities were exposed on 9/11. Travelers from all over the world are screened three or more times, with their names run through databases that draw on staggering amounts of intelligence and law enforcement information. The process flags all manner of misdeeds or suspicious information.

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