. >> next, on american history tv, constitutional scholars philip discussand akil lamarr and interpret how impeachable defenses are defined for the president. bobbitt was the legal counsel to the iran contra committee and is the co-author of "impeachment, the new edition handbook, originally published in 1974 during the water rate -- watergate crisis. the new york historical society hosted this one hour-long event. [applause] >> good evening, everyone. welcome to the new york historical society. i'm the manager of public programs here and is always it's a thrill to welcome you to our robert h net auditorium. tonight's program is part of our bernard and irene schwartz distinguished speaker series and is always the would like to thank mr. swartz for his support, which has enabled us to invite so many scholars here to new york historical. i would like to recognize and patricia andstees, alan, as well as the chairman's councilmembers who were with us for their great work and support. tonight's program will last one hour and include a q&a session, question and answer. of some of our volunte