"Having Meuller on the task takes all the pressure off." 

I guess you mean Robert Mueller and are still missing that Umlaut, are you?  LOL 

As I mentioned in an earlier post: "Robert Mueller just looks at all the facts, issues whatever subpoenas he believes to be advancing the investigation i.e. shines the bright light of day on the matters under investigation, including the nocturnal Trump tweets."

Now which part of that is hard to understand? Even if Trump should not be concerned — wouldn't surprise me, since he hasn't the closest of grasp when it comes to facts — his advisors are probably a lot less sanguine the way "things" are going.