robert mueller stopped and interrogated at least two ultra wealthy russians at u.s. airports and investigators want to know whether these russian oligarchs illegal ly funneled money. joining me now for more on this, we have shimon prokupez and a former federal prosecutor. one of the things is how aggressive the mueller team is being here. we re seeing this time and time again, the idea that the fbi is tracking how some of the russians are traveling into this country, putting alerts, perhaps, on their travel and then meeting them at the airport. as we know in one case, they met an oligarch at a new york airport. they stopped him.