"We have confirmed that the news reports that the special counsel had subpoenaed financial records relating to the President are false", Mr Sekulow said in a statement.
Germany's largest bank received a subpoena from Mr Mueller several weeks ago to provide information on certain money and credit transactions, the person said, without giving details, adding key documents had been handed over in the meantime. Earlier this year, Democrats in the House of Representatives asked Deutsche Bank to provide details on Trump's finances, but the bank wouldn't do that without a formal request.
Deutsche Bank, which has loaned the Trump organisation hundreds of millions of dollars for real estate ventures, said it would not comment on any of its clients.
Trump's relationship with Deutsche Bank stretches back some two decades and the roughly $300 million he owed to the bank represented almost half of his outstanding debt, according to a July 2016 analysis by Bloomberg.
The news came days after Mueller unveiled his fourth indictment in the sprawling Russian Federation probe, which is examining possible collusion between Trump's presidential campaign and what USA intelligence believes was an effort by Moscow to tilt the election in his favor.
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Holding Trump debt, particularly if some of it was or is soon due, could potentially give Russian banks some leverage over the US President, especially if they are state-owned, said a second US official familiar with Russian intelligence methods.
But until Mueller opts to bring his investigation into the public eye, we're unlikely to know for sure whether he's chose to cast his net so broadly. 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.
Special Counsel Robert Mueller departs Capitol Hill after briefing members of the U.S. Senate on his investigation in Washington, June 21, 2017.
Democratic senators, including Dianne Feinstein, suggested after the Flynn plea that Mueller might be building an obstruction of justice case against Trump.
Meanwhile, White House attorneys denied the Bloomberg report as well. Over the weekend on Twitter, he attacked the Federal Bureau of Investigation and Mueller's team and defended some of Flynn's actions.