It is Trump who is in control of this. He keeps obsessing about it on Twitter. When he shuts up, the media backs off. When he squawks, they media rightfully starts asking, what is he hiding?
Maybe Trump is diabolically manipulating this Russia story, bringing it up to throw smoke in the air when something more important is going down which he doesn’t want the public to focus on.
Or maybe Trump is freaked out because Mueller has the capability of discovering things from Trump’s past where he did illegal things with Russian oligarchs — that would be by far the worst outcome for him, as it might put him and his family in jail.
The point is, Mueller will figure it out. Why get upset, Ms Johnstone and Mr Trump? Relax.