foreign governments don't interfere to benefit us. they intervene to benefit themselves. >> thank you, professor gerhardt, you have quinn extensively about our system of checks and balances, what happens to that system when the president undertakes a blockade of congress's impreechlt inquiry -- impeachment query and orders all recourse? >> when the president does that, the separation of powers means nothing. the subpoenas that have been issued, of course, are lawful orders. in our law schools, we would teach ourp students, this is an easy straight forward situation, you comply with the law. lawyers all the time have to comply with subpoenas but in this situation the full scale obstruction, full scale obstruction of subpoenas i think torpedos separation of powers and, therefore, your own recourse is to either in a sense protect your institutional prerogatives, that would include impeachment. >> the same is true of defying congressional subpoenas on a wholesale basis with respect to