Many legal analysts,including Fox News # 1 legal analyst Andrew Napalitino say Trump can be charged with obstruction of justice and a sitting President can be indicted.
Mueller should bring the charge. The facts are in Trump's favor. Particular since he had a recommendation from Rosenstein to do it and then they uncovered Trumps notes which all are in his favor. A wide range of factors were considered.
I will state as I have and will continue to state: I am 100% in favor of Mueller trying to get a prosecution of Trump for this. As has been the case throughout Mueller's career, his big swinging dick when is not in court yet, gets shredded to pulp when defendants get to actually defend themselves. Yes, he gets some chickenfeed perjury convictions from third tier players but the big fish skate. Comey had a sterling reputation as Mueller does/did. But the minute comey tried to handle anything complex, his career ended and he become the subject of scorn of both dems and republicans. Mueller has a lot of big losing cases under his belt. The quicker he can bring the obstruction charge or fail to be able to bring it, then the quicker he becomes another big buffoon lose. Go for it, by all means.