Deutsche Bank received a subpoena from Mueller's team several weeks ago, compelling the bank to share information on credit and money transactions, a person close to the matter told Reuters Tuesday, confirming a report by German daily Handelsblatt published Tuesday.
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.
"Deutsche Bank always cooperates with investigating authorities in all countries", the lender said in a statement to Bloomberg Tuesday, declining to provide additional information.
United States 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. In 2008 Trump sued the bank to get out of $40 million in guarantees he had made them on his loan.
The New York Times has reported that bank regulators were reviewing hundreds of millions dollars worth of loans that Donald Trump's businesses had with Deutsche Bank, Germany's largest.
According to Bloomberg, he owes the bank about $300 million.
Conyers won't seek re-election amid sexual harassment claims
Conyers flew home to his district last week and checked into the hospital for what a family consultant said was stress. CBS news has also learned that Conyers' grand-nephew, Michigan State Senator Ian Conyers, will run for his seat.
Russian Federation has denied meddling in the election and Trump has said there was no collusion.
The bank also gave his Trump Int'l Hotel and Tower, Chicago, a loan of up to $640 million, according to a 2012 property filing.
Mr. Mueller's investigation has led to charges against former Trump campaign chairman Paul Manafort and his longtime business partner Rick Gates for work unrelated to the campaign.
Former White House national security advisor Michael Flynn pleaded guilty Friday to making false statements to the Federal Bureau of Investigation about his contacts with Russian ambassador Sergey Kislyak.
Trump told the New York Times this past summer he would consider it a "violation" if Mueller were to expand the probe beyond Russian Federation.