News broke Tuesday morning that Deutsche Bank has given Mueller's investigation Trump's personal bank account information.
USA investigators are said to be demanding information on dealings linked to Mr Trump as part of an investigation into alleged Russian influence in the United States presidential election, according to Handelsblatt and Reuters.
The bank has rejected the efforts of House Democrats to provide details of Trump and his family's finances, saying it would be illegal to share client data without a formal request.
The Trump family conducts its financial transactions through numerous channels, of course, but it's Deutsche Bank in particular that has continued to lend millions to the Trump Organization for real estate deals.
Mr Trump has repeatedly denied any collusion with Russian Federation, calling the allegations a "witch hunt".
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Regulators want to know if Mr. Trump exposed the bank to unnecessary risk after casino and hotel bankruptcies left the German bank among a short list of financial institutions willing to do business with him, the Times reported.
The fact that Mueller wants records specifically from Deutsche Bank is itself a hint at the counselor's investigative angle. Bloomberg says that outstanding debt, reported in July, included a $170 million loan for finishing a hotel in Washington, D.C.
Flynn is now cooperating with federal investigators.
Mueller has also obtained a guilty plea from Trump campaign foreign policy advisor George Papadopoulos.
Mueller's subpoena arrived just days after one of the most significant developments in the investigation to date, after former national security adviser Michael Flynn pleaded guilty to making false statements to the FBI earlier this year and promised to cooperate fully with the investigation. Two other Trump figures, former campaign chair Paul Manafort and Rick Gates, have been arrested on money laundering charges.