A Libyan militant suspected in the deadly Sept. 11, 2012, attack on Americans in Benghazi has been captured and is in U.S. custody, marking the first U.S. apprehension of an alleged perpetrator in the assault that killed U.S. Ambassador Chris Stevens and three other Americans. President Barack Obama said Ahmed Abu Khattala, a senior leader of the Benghazi branch of the terror group Ansar al-Shariah in Libya, will "now face the full weight of the American justice system." "The fact that he is now in U.S. custody is a testament to the painstaking efforts of our military, law enforcement, and...