Sater is an interesting guy. Mobster, Russian asset, US gov't informant, US gov't asset. Guy who promised to bring Putin onside to get Russia tower built and Trump elected.
Of course Trump even lied about knowing him despite Slater actively at the time trying to broker a deal to get the Tower built in Dec 2015 when Trump was on the campaign trail. So Trump was compromised at that point as they were out begging Putin to approve Trump tower while Trump was lying and saying he had no dealings with Russia. All the while Putin knowing Trump is lying every time he opens his mouth and therefore exposing himself more and more to Russian control and influence after all Russia could expose the lies at any time.
These are two good exposes on him for those interested.