Thanks flr the briefing Agent Jello
They did start a CI investigation of Trump as he had Russians coming out of his arse so the fear was there. (There are books and accounts given by former KGB agents, but i am a bit more unsure of that info so i hold back). Particularly as the Mueller investigation continued, not to mention the Trump family's own admissions of taking russian money, of having his campaign manager conversing with russian agents, of him setting up a server to contact russians where they wont be eavesdropped by US intel, lying about their contacts with russia (140 documented contacts) etc. But Rod Rosenstein, the deputy AG, killed it. Not sure why, maybe out of fear if Trump got wind of it he'd kill the Mueller investigation or something like that.