His speech stems from the drone attack on U.S. born al-Qaida cleric Anwar Al-Awlaki in Yemen last year.
At least three lawsuits have been filed to force the white house to release its justification for the attack.
In his speech, Holder will reportedly cite the joint congressional resolution passed after the 9-11 attacks authorizing the use of all necessary force to prevent any future acts of international terrorism against the U.S.
