Looking back at America's longstanding ties to Afghanistan

It's been three months since the U.S. withdrew its forces from Afghanistan, but America's involvement there didn't begin after Sept. 11, 2001. It began decades earlier, after the Soviet Union invaded that country in 1979 and the U.S. began working with Saudi Arabia and Pakistan to counter its rival's influence. Nick Schifrin spoke with one of the key architects and partners in that effort.