Tapper contributed regularly to Good Morning America, Nightline, and World News with Diane Sawyer. In addition to anchoring World News and Good Morning America weekend editions and Nightline, Tapper was a frequent substitute host of This Week and served as interim host for much of 2010, scoring the first TV interview with CIA director Leon Panetta, as well as exclusives with Vice President Biden, White House Chief of Staff Rahm Emanuel, retired General Colin Powell, and former Federal Reserve chairman Alan Greenspan, in addition to interviews with other newsmakers such as House Majority Leader Steny Hoyer, D-Maryland, House Minority Leader John Boehner, R-Ohio, and Senate Minority Leader Mitch McConnell.