braces_for_impact said:
If he was an agent say, since 1987, he is now surrounded by the Secret Service, Intelligence personnel, and he lives in the White House. He's gone from being a businessman with almost no oversight to constantly being scrutinized. I fail to see how they would NOT have to reestablish lines of communication. He can't exactly pick up a phone or walk out the back door of the White House to get in touch.
ETA: Which is interesting because we are always seeing reports of him trying to work around established lines of communication, such as trying to use his own phone, etc.
He was not in the WH when Butina was working on establishing such a channel. But moreover, if a Russian agent were getting close to being POTUS (or having a non-negligible chance), Putin would be on it, and Russia would be establishing upgraded links as he approaches his goal. They wouldn't just green-light an operation by a low-level Russian agent (Butina) who doesn't even have clearance to know he's another Russian agent. They would always keep more than one communication channel open. Moreover, if Butina only tried to set up a meeting between Trump and Putin, also why would Russia would want her to set up a meeting between their most valuable agent and their president? That creates all sorts of unnecessary risks.
I think you're making some assumptions that we don't know about. We don't know that Trump is an agent. In fact, I would more likely consider him an asset, whether knowingly or unknowingly. Personally, my bet would be that the Trump family who for a long time has had nefarious business practices, decided to make some deals with people. They knew those people were shady, but as they got sucked in deeper they figured out the deals they were making were with some much more high profile and dangerous people. But again that's just supposition on my part.
My point in the entire post is that you have various covert programs running simultaneously. They may overlap, or they may not, but they will push towards a common goal overall. Some will be successful, and they will yield other assets which have different ways of contributing to your cause, and others will not. The other point to remember about Russia is that it's easy to picture Putin the mastermind, running everything and knowing all, but that's not really how Russian intelligence works. Russian intelligence is deeply rooted not just in actual intelligence services like the FSB, but in their technology and banking sectors, and their businesses, especially those businesses of oligarchs that are allied to Putin.