So, let's review some the Mueller mandate:
(b) The Special Counsel is authorized to conduct the investigation confirmed by then-FBI Director James 8. Corney in testimony before the House Permanent Select Committee on Intelligence on March 20, 2017, including: (i) any links and/or coordination between the Russian government and individuals associated with the campaign of President Donald Trump; and (ii) any matters that arise or may arise directly from the investigation; and (iii) any other matters within the scope of 28 C.F.R. § 600.4(a).
(c) If the Special Counsel believes it is necessary and appropriate, the Special Counsel is authorized to prosecute federal crimes arising from the investigation of these matters.
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Links and coordination between individuals associated with the Trump campaign and Russia? In spades.
Any matters that arise directly from the investigation? How about 36 indictments, and Trump's personal lawyer, the head of his campaign, and his director of national security going to jail?
here's an important part: "he Special Counsel is authorized to prosecute federal crimes arising from the investigation of these matters"
So yes, Trump cult, Mueller can dig through the president's personal and business finances, if that is where the investigation takes him. That is why he has been authorized to grant immunity to trump's #1 accountant. And you KNOW that guy has a story to tell.