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Edgar Maddison Welch, 28, pleaded guilty Friday to two charges related to last year's armed confrontation at the Comet Ping Pong restaurant in Washington, D.C. Welch says he was "self-investigating" false Internet rumors of a pedophile ring at the pizzeria. Jose Luis Magana/AP hide caption

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Jose Luis Magana/AP

The Dec. 4 incident, in which Edgar Welch is accused of entering the Comet Ping Pong restaurant and firing a rifle, has unnerved politicians and Washington locals alike. Jessica Gresko/AP hide caption

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Jessica Gresko/AP

In a speech on Capitol Hill honoring outgoing Senate Majority Leader Harry Reid on Thursday, Hillary Clinton warned of the dangers of fake news. Brendan Smialowski/AFP/Getty Images hide caption

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Brendan Smialowski/AFP/Getty Images