As law enforcement officials investigate the shooting of National Guard members in Washington, D.C., U.S. immigration policy has undergone rapid changes.

The Trump administration has abruptly halted the processing of any immigration requests from Afghan nationals, and the president has vowed to further tighten his crackdown on immigration.

Here is what we know.

D.C. police heighten security measures for troops

Federal authorities and the Metropolitan Police Department confirmed Saturday that every group of National Guards patrolling the city will be accompanied by at least one D.C. police officer, though details were scant. (The development was first reported by The Washington Post.)

According to a police official who spoke to NPR on condition of anonymity, because he was not authoriz

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