Further, it is alleged, at least during Cheney's term as Secretary of Defense from 1989–93, that Addington and Cheney were deeply and eagerly interested in the US Continuity of Operations Plan (CO-OP), to be used in the event of a nuclear attack on the US (and first partially implemented after 9/11/01). This plan is alleged to provide "enduring Constitutional government" under a "paramount unitary executive" with "cooperation from" Congress and the several Courts. This deep and eager interest in the CO-OP was reported by the "New Yorker" to extend to drills where Cheney spent his nights in a bunker, perhaps that "secure undisclosed location" which he was said to occupy following 9/11. Apparently Addington has taken this interest to the point where "For years, Addington has carried a copy of the US Constitution in his pocket; taped onto the back are photocopies of extra statutes that detail the legal procedures for Presidential succession in times of national emergency..." perhaps, even a national emergency that involves the CO-OP.