(FOX NEWS) — Robert Mueller, the special counsel investigating alleged Russian election meddling, reportedly subpoenaed Deutsche Bank several weeks ago, calling on the German bank to submit data pertaining to its client relationship with President Trump.

Bloomberg, citing an unnamed source, reported that Mueller is seeking information on the giant lender and its relationship with Trump and his family. Trump reportedly owes the bank $300 million.

Democrats have said Trump’s relationship with the bank is crucial in the Russia investigation. The Washington Post reported in August that Democrats have pushed for an investigation into the bank’s internal review of the loans to see if there is any link with Russia.

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