Jeopardize the FBI probe in what way?
Threaten its ability to run forever without any determination?
Was not Nixon accused of using a CIA ruse to coverup a watergate era campaign donation? Seems to me citing an investigation that does not exist as a reason to compel repeal of a subpeona for testimony to Congress is an Obstruction of Justice. It further seems to me that whomever launched the ballon needs be taken out of the white hut in cuffs. If it is his excellency, this is a high crime.