NEW : Official : Abu Khatallah denied involvement but gave info on others . But U.S. officials say they collected surveillance video , phone recordings and witness statements to bring charges against Abu Khatallah and others involved . Abu Khatallah gave information before and after he was told his Miranda rights . ' Lindsey Graham : Mirandizing Abu Khatallah ` ` would be a mistake for the government '' He is suspected of being the architect of the February 2012 attacks in Benghazi , Libya .
NEW : Official : Abu Khatallah denied involvement but gave info on others . Abu Khatallah gave information before and after he was told his Miranda rights . ' Lindsey Graham : Mirandizing Abu Khatallah ` ` would be a mistake for the government '' He is suspected of being the architect of the February 2012 attacks in Benghazi , Libya .