GOP rep announces retirement after threats of violence, Trump celebrates - a podcast by Chris Hayes, MSNBC

Guests: Rep. Joe Neguse, Brandy Zadrozny, Dr. Celine Grounder, Craig Whitlock, Rep. Ro Khanna
Tonight: Barricades at the Capitol, as threats of physical violence helped scare a United States Congressman into retiring. Then, making sense of the FDA's split decision on vaccine booster shots. And Rep. Ro Khanna on the hearings to investigate fossil fuel's role in climate change.

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