The report in the Handelsblatt newspaper cites only "informed circles".
The details of the expenditures related to Mueller's investigation were laid out in a copy of the report obtained by The Associated Press, which was subsequently released publicly by the special counsel's office.
"The latest news supports our view that Mr. Mueller is too conflicted to investigate the FBI and should step down in favor of someone more credible", the newspaper said.
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The Oklahoma quarterback was a dark-horse candidate entering the season, and he lived up to the billing and then some. Mayfield led the Sooners to a College Football Playoff berth with 4,340 yards, 41 touchdowns and five interceptions.
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Deutsche Bank told Bloomberg it "always cooperates with investigating authorities in all countries". "The investigation would surely continue, though perhaps with someone who doesn't think his job includes protecting the FBI and Mr. (James) Comey from answering questions about their role in the 2016 election". He said that they have confirmed it with the bank itself and "other sources".
A USA official with knowledge of Mr Mueller's probe said one reason for the subpoenas was to find out whether Deutsche Bank may have sold some of Mr Trump's mortgage or other loans to Russian state development bank VEB or other Russian banks that now are under U.S. and European Union sanctions. Mueller incorporated several ongoing investigations within the Justice Department including those of Trump campaign contacts with Russian Federation, former Trump campaign chairman Paul Manafort's business activities and former national security adviser Michael Flynn.
Previous special counsel investigations, including probes of President Bill Clinton in the late 1990s, have also spent millions over a few months' time. Mueller's investigation had expanded to examine a broad range of transactions involving the president's businesses, including dealings by his son-in-law, Jared Kushner, and Commerce Secretary Wilbur Ross, a person familiar with the probe told Bloomberg News after the publication of the Times interview. "Then Justice claimed that providing House investigators with classified material could hurt security or sources".
However, White House spokeswoman Sarah Sanders rejected reports of a subpoena for Trump-related financial records as "completely false", as did Trump's personal attorney Jay Sekulow.