[Alberta's Child]

I suspect Trump would be perfectly fine letting Mueller delve into his personal finances through Deutsche Bank -- up to a point.

That would likely be legitimate grounds for Sessions (not Rosenstein) to re-insert himself into the special counsel's activities.

[Cboldt]

-- I suspect Trump would be perfectly fine letting Mueller delve into his personal finances through Deutsche Bank -- up to a point. --

The article says otherwise. Trump would be justified in being livid if Mueller expands his investigation to events that are not related to the campaign.

-- That would likely be legitimate grounds for Sessions (not Rosenstein) to re-insert himself into the special counsel's activities. --

The way I see it, it's up to Rosenstein to regulate Mueller's jurisdiction. Any direct contact with Mueller, from Sessions, is problematic. Sessions can't (or shouldn't) directly insert himself into Mueller's house. What he does is make Rosenstein do it, and answer for it. And if he is not satisfied with it, Sessions can fire Rosenstein for abdicating DoJ jurisdiction.