 Complete the following phrase:  On September 30, 2011 a drone strike in Yemen killed American citizens Anwar al-Awlaki and Samir Khan. Both resided in Yemen at the time of their deaths. The executive order approving Al-Awlakis death was issued by Barack Obama in 2010, and was challenged by the American Civil Liberties Union and the Center for Constitutional Rights in that year. The U.S. president issued an order, approved by the National Security Council, that Al-Awlakis normal legal rights as a civilian should be suspended and his death should be imposed, as he was a threat to the United States. The reasons provided to the public for approval of the order were Al-Awlakis links to the 2009 