University of North Carolina at Chapel Hill

Trump shuts door on refugees, but will the US be safer?

President Donald Trump says his halt to immigration from seven Muslim-majority nations and ban on refugees is being done in the name of national security. But it's not clear the measures will help prevent attacks on American soil, and they could wind up emboldening extremists who already view the U.S. as at war with Islam.

Recent acts of deadly extremist violence have been carried out either by U.S. citizens or by individuals whose families weren't from the nations singled out. And the list of countries in Trump's order doesn't include Saudi Arabia, where most of the Sept. 11 hijackers were from, or other places with a more direct link to terrorism in America.

The admissions...