President Obama’s National Security Council may have shaped the policy decision that led to decreased security at the U.S. consulate Benghazi, where the U.S. Ambassador to Libya was murdered last month, according to House investigators.

State Department officials rejected requests for extra security because they were trying to “effectuate a policy of ‘normalization’ in Libya,” investigators learned. In a new letter from the House Oversight and Government Reform Committee to President Obama, lawmakers suggests that the buck really did stop with him in terms of formulating that policy.