After two National Guard members were gunned down by an immigrant from Afghanistan, President Trump immediately seized on the shooting to escalate nativist fears of foreigners.

"This attack underscores the single greatest national security threat facing our nation," he bellowed. He followed this up by vowing to "permanently pause migration from all Third World Countries" and even expel "anyone who is not a net asset to the United States."

The shootings were a tragedy. The killer should be prosecuted and punished. But Trump's immediate impulse -- to demonize immigrants as a danger to the nation -- is based on a falsehood. It's a vicious and readily debunked lie.

Every serious study of the link between immigration and crime has come to the same conclusion: Foreigners are far less likely t

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