Mark Sanford on fighting to define the Republican Party

Mark Sanford, former South Carolina governor and congressman, is breaking with his party to mount a primary challenge to President Trump in 2020. Sanford has long been outspoken about his objection to Trump -- a perspective that saw him defeated in his own congressional reelection bid. Sanford sits down with Judy Woodruff to discuss his party’s identity, federal spending, climate change and more.