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Tonight: what we know about the bombing that killed U.S. Service Members and Afghan nationals at the Afghan airport, what it means for the evacuation effort, and what it means for ending the war. Then, an NBC News Exclusive: the Capitol Police Officer responsible for shooting and killing Ashli Babbitt speaks out for the first time. Tonight, why he's revealing his identity now—and why he decided to shoot. And former Attorney General Eric Holder on the Republican plan to take back power.

Guests: Missy Ryan, James LaPorta, Azmat Khan, Damon Hewitt, Eric Holder