The President, Congress, and the Senate Judiciary Committee authorized a lethal strike direct against US Citizen Anwar al-Alaki.
Attorney General Eric H. Holder Jr. stated to the Senate Judiciary Committee that targeting a U.S. citizen was permissible as long as the person posed "an imminent threat of violent attack against the United States" and that capture was "not feasible."
Explain in full the imminent threat to the United States which was halted by the execution without due process of Anwar al-Alaki. Include a complete time table showing at what point neutralization of al-Alaki would no longer protect the United states, as well as the expected time such an attack would occur.