The son-in-law of Osama bin Laden has unexpectedly testified at his terrorism trial. Sulaiman Abu Ghaith took the stand on Wednesday to deny having prior knowledge of 9/11 and other plots against the United States. During his testimony, Abu Ghaith described meeting with bin Laden inside a cave in Afghanistan just hours after the attacks on the World Trade Center and the Pentagon. He is the most senior alleged al-Qaeda member to be tried in a U.S. civilian court in the years since 9/11.