The shooting of two National Guard soldiers in Washington, D.C., last week has sparked a national debate about U.S. immigration policy and whether the federal government missed any red flags about the alleged attacker, identified by authorities as 29-year-old Afghan national Rahmanullah Lakanwal .

The Trump administration has cited the attack, which killed one of the soldiers, to further expand its government-wide immigration crackdown. The administration has halted all visa and immigration processing for Afghan nationals, ordered a review of green card cases for immigrants from 19 countries and frozen all asylum case decisions.

Lakanwal's exact motives remain unclear. Over the weekend, Homeland Security Secretary Kristi Noem suggested he could have "radicalized" after coming

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