The White House has said reports asserting special counsel Robert Mueller subpoenaed financial records connected to the President "are completely false".
In July, Trump said in an interview with the New York Times that if Mueller examined his family's finances beyond any relationship with Russian Federation he'd consider it "a violation".
Deutsche Bank has loaned the Trump organization an estimated $300 million for its real estate dealings prior to Donald Trump becoming president.
Trump has done billions of dollars' worth of business with Deutsche Bank in the past 20 years; he has previously said that he would consider Mueller looking into his finances beyond any connection to the Russian Federation investigation "a violation".
Reuters news agency and a German newspaper say a subpoena has been issued by Mr Mueller and sent to the Deutsche Bank (one of the Trump Organisation's major lenders) two weeks ago demanding details on Trump's transactions.
Donald Trump's personal banking information has formally been turned over to Robert Mueller, the special prosecutor who is investigating whether the president's campaign conspired with the Kremlin during the 2016 presidential election.
Mr Trump has repeatedly denied any collusion with Russian Federation, calling the allegations a "witch hunt".
"I think that's a violation", Mr. Trump told the paper.
Deutsche Bank rejected demands in June by U.S. House Democrats to provide details of Trump's finances, citing privacy laws.
Deutsche Bank did not immediately respond to a request for comment.
Deutsche Bank is not the only Trump-related business interest that is attracting the attention of investigators. Last week Michael Flynn, Trump's former national security adviser, pleaded guilty to a single count of making false statements to the Federal Bureau of Investigation.
The special counsel also spent $223,643 on travel, nearly entirely for staffers who temporary relocated to the investigation's headquarters in Washington.
"One obvious question is why Trump and those around him expressed interest in improving relations with Russian Federation as a top foreign policy priority, and whether or not any personal considerations played any part in that", the second official said, speaking on the condition of anonymity. In October, the first indictments in his probe were unsealed in court against Trump's former campaign manager Paul Manafort and an aide, Rick Gates.