Special Counsel Robert Mueller has spent more than $3.2 million in the opening months of his federal criminal investigation into Russian interference in last year's USA election and whether President Donald Trump or anyone close to him colluded in it.
The Guardian, citing German newspaper Handelsblatt, reported that the bank has since cooperated with the request and handed over banking records to investigators.
Mueller was appointed special counsel in May, after President Donald Trump fired Federal Bureau of Investigation director James Comey.
A USA official with knowledge of Mueller's probe said one reason for the subpoenas was to find out whether Deutsche Bank may have sold some of Trump's mortgage or other loans to Russian state development bank VEB or other Russian banks that now are under US and European Union sanctions.
Suffice it to say, for President Donald Trump's supporters who see the investigation as little more than a witch hunt, the reaction was not too pleasant.
Trump, his wife, daughter Ivanka and son-in-law Jared Kushner are understood to beclients of Deutsche Bank.
"I don't make money from Russian Federation", he told The New York Times. After a string of bankruptcies and broken promises, pretty much every other major bank stopped lending Trump money some years ago.
Deutsche Bank, which has loaned the Trump organization hundreds of millions of dollars for real estate ventures, said it would not comment on any of its clients. Sources familiar with Trump's borrowing from the bank told The Financial Times the total he owed is more like $300 million. "Over the years, I've looked at maybe doing a deal in Russian Federation, but I never did one". Law professor Ryan Goodman suggests that Mueller could be trying to determine if Trump's loans from the bank were guaranteed by Russian interests, which could mean he was indebted to them in ways that could compromise him. Democrats on the House Financial Services Committee asked the bank in May for information about reports that it might have been a conduit for Russian money for the Trump family.
Reports of the subpoena come after Mr Trump's former national security adviser, Michael Flynn, last week admitted he had lied to the FBI over his contact with Russia's ambassador and agreed to cooperate with Mr Mueller's investigation.