Republican Sen. Bob Corker of Tennessee has had a series of clashes with President Trump, most recently on the administration's muted response to Saudi Arabia's killing of Washington Post columnist Jamal Khashoggi. The chairman of the Senate Foreign Relations Committee is now prepairing to step down. John Dickerson visited with Corker in Chattanooga to talk about how Washington works – or doesn't – and what worries him about the issues no one seems interested in addressing.
