Russia pushed a conspiracy theory that the United States is helping Ukraine develop biological weapons. There's no evidence for that, but the idea did end up on Tucker Carlson Tonight — a Fox News show that reaches, on average, more than 3.5 million viewers with each episode. How did the conspiracy theory find its way from the Kremlin to American conservative media?This episode: White House correspondent Asma Khalid, voting reporting Miles Parks, and domestic extremism correspondent Odette Yousef.Connect:Email the show at nprpolitics@npr.orgJoin the NPR Politics Podcast Facebook Group.Subscribe to the NPR Politics Newsletter.Find and support your local public radio station.