The Russia-related investigation is interested in a Cyprus bank connected to a flow of illegal Russian funds into the New York real estate market.

Mueller’s team has separately issued a subpoena for information from Deutsche Bank. The German bank is Trump’s biggest lender.

Let's not forget that Trump's Commerce Secretary, Wilbur Ross, sat on the Board of Directors of that Cyprus bank.

Paradise Papers: Leaks Show Wilbur Ross Hid Ties to Putin Cronies - NBC News