[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.

[Alberta's Child]

It's only up to Rosenstein to regulate Mueller's jurisdiction to the extent that Mueller is operating within the confines of the issue that drove Sessions to recuse himself.

If Mueller starts wandering down a road that has nothing to do with the 2016 election, then Sessions' recusal is not relevant to the matter at hand and he would be perfectly within his authority to deal directly with Mueller on that particular matter. That's the way I see it.

[Alberta's Child]

P.S. — If Sessions orders Rosenstein to take action against Mueller in any way, how is that any different than Sessions dealing with Mueller directly?