Coming Up on 'This Week': Secretary of State Hillary Clinton

WASHINGTON, Oct. 21, 2011— -- U.S. troops are coming home from Iraq as President Obama announces a complete withdrawal by the end of the year, after more than eight years of war. And Libyan dictator Moammar Gadhafi meets a violent end at the hand of rebels. As two major stories shake up the Arab world, two big newsmakers come to "This Week."

Christiane Amanpour was the last western journalist to interview the Libyan strongman, and now she speaks with Secretary of State Hillary Clinton about what Gadhafi's death means for Libya's future, and for U.S. interests in the region. And as the U.S. military pulls out of Iraq, has the mission there been accomplished?

Christiane also talks with the top Republican on the Senate Armed Services Committee, Sen. John McCain, on how the U.S. should move forward in Libya, and what the withdrawal from Iraq means for security and stability. ABC News Senior Foreign Affairs Correspondent Martha Raddatz, Time Magazine Managing Editor Richard Stengel, who traveled this week with Secretary Clinton, and Brookings Institution Senior Fellow Robert Kagan join Sen. McCain to discuss the Obama administration's approach to war and conflict.

Then, sparks fly at the latest Republican debate in Las Vegas, but will the intraparty battles hurt the GOP's chances to win the White House? Republican pollster Frank Luntz called the performance "horrific," saying that a divided party may lead to a second term for Obama. Luntz joins our powerhouse roundtable with George Will, Donna Brazile, Matthew Dowd and ABC News Senior White House Correspondent Jake Tapper to analyze all the week's politics, and what the latest debate signals in the battle for the Republican nomination.

Plus, AFL-CIO President Richard Trumka and Chamber of Commerce President Tom Donohue rarely agree on anything, but they both believe the U.S. can create more jobs by fixing America's crumbling infrastructure. But can they get the political parties to agree on how to get that done? Can big labor and big business come together to help bring America's economy back in a big way?

Secretary Clinton, Sen. McCain, Richard Trumka and Tom Donohue, Sunday on "This Week with Christiane Amanpour."