What began as a horrific shooting of two National Guard members in downtown Washington last week has now led to a set of far-reaching changes to the U.S. immigration system.The suspect, Rahmanullah Lakanwal, was among the Afghans who came to the United States after the Taliban’s takeover of Afghanistan. Earlier, he served in a paramilitary unit that worked with U.S. forces.Hamed Aleaziz discusses Mr. Lakanwal’s journey to the United States, as well as the Trump administration’s wide-ranging response.Guest: Hamed Aleaziz, a Times correspondent covering the Department of Homeland Security and immigration policy.Background reading: 

• The suspect in the shooting had traveled a long path of conflict from Afghanistan to America.
• Afghans who assisted the United States during the war underwent rigorous vetting.

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