Brother Vindman is about to become the subject of a Grand Jury investigation. The NSA doesn’t eff around with this kind of thing. If he went to a foreign country now, Brother Vindman would likely have an accident of the terminal kind.
They reported it through channels, including to the Secret Service, for obvious reasons back in Jan 2017
Not unreasonable to assume they may have been under enhanced scrutiny for quite some time. Given their arrogance and stupidity, no telling what they may have disclosed over the last few years