the executive branch as well not to cooperate the congress. those together with a lot of other evidence suggests obstruction of congress. >> professor karlan, do you agree? >> i'm a scholar of the law of democracy. so as a citizen, i agree with what professor gerhardt said. as an expert, my limitation is that i'm a scholar of the law of democracy. i'm not a scholar of obstruction of justice or obstruction of congress. >> we will accept your opinion as a citizen. professor feldman, the obstruction of congress is a problem because it undermines the basic principle of the constitution. if you're going to have three branches of government, each of the branches has to be able to do its job. the job of the house is to investigate impeachment and to impeach. a president who says as this president did say i will not cooperate in any way, shape or form with your process robs a