When his Twitter account was first deleted I thought it was the one advisor with a brain cell convincing him that Tweeting whimsical shite about an investigation whilst you're President and being investigated, wasn't a good idea.
Seriously, why haven't his lawyers demanded he stop Tweeting? I've zero legal training but if my boss was being investigated by someone as thorough and fastidious as Mueller appears to be then: "Stop chatting shit in public" would be the first thing I'd advise. Evidence that Trump is surrounded by people happy to be paid to tell him what he wants to hear. It's not surprising. He's largely in this situation because his advisors anticipated the firing Comey to be a brilliant tactical move. Clearly the President hasn't surrounded himself with the best and the brightest. Never ideal but when the President himself is a fecking moron, it's catastrophic.