Coming up on "This Week": President Bill Clinton; Iranian Foreign Minister Javad Zarif Sunday on "This Week," with a looming government shutdown just days away, George Stephanopoulos goes one-on-one with former President Bill Clinton on the budget battles in Washington and his latest work with the Clinton Global Initiative. Plus, in an ABC News exclusive, Iranian Foreign Minister Mohammad Javad Zarif discusses the latest talks over Iran's nuclear program, and his historic meeting with Secretary of State John Kerry this week. And our powerhouse roundtable debates all the week's politics, with ABC News political analyst Matthew Dowd, former Michigan Gov. Jennifer Granholm, Weekly Standard editor Bill Kristol, and New York Times columnist and Nobel Prize-winning economist Paul Krugman. And in our "Sunday Spotlight," retired U.S. Army Ranger Jeff Struecker discusses his return to Somalia for the new documentary "Return to Mogadishu," 20 years after he was caught in the battle immortalized in "Black Hawk Down."