Greenwald: FBI Informant in Trump Campaign Once Ran CIA Spy Operation Helping Reagan Win in 1980

A top House Republican has defended the FBI against a series of attacks by President Trump, who's claimed without evidence that the bureau planted a spy in his 2016 presidential campaign. Rep. Trey Gowdy, chair of the powerful House Oversight Committee, said Tuesday that the FBI was acting properly when it deployed a confidential informant-Stefan Halper-to investigate Russian attempts to interfere in the election. We talk to Glenn Greenwald about Halper's involvement in the CIA and the 1980 election of Ronald Reagan.