Sen. Tim Scott, Sen. Chris Coons, Amb. Mike Waltz, Rep. Michael McCaul

Longtime South Carolina Sen. Lindsey Graham dies at 71. ABC News' Martha Raddatz remembers the late Sen. Lindsey Graham, R-S.C., on "This Week." Sen. Scott on Graham's death: ‘America lost a statesman, but I lost a friend.' ABC News' Martha Raddatz interviews Sen. Tim Scott, R-S.C., on "This Week." UN Amb. Waltz: ‘The Iranian regime is trying to kill President Trump.' ABC News' Martha Raddatz interviews Mike Waltz, U.S. ambassador to the United Nations, on "This Week." High-stakes Maine Senate race draws national attention. ABC News' Jay O'Brien reports from Maine with all eyes on the pivotal U.S. Senate race there. Swan: Graham was ‘an orchestra conductor' for voices in Trump's ear. The Powerhouse Roundtable breaks down the latest news on "This Week." McCaul: ‘We owe it to Lindsey Graham to pass that tough Russian sanctions bill'. ABC News' Martha Raddatz interviews Rep. Michael McCaul, R-Texas, on "This Week."