Donald Trump’s 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. Deutsche Bank, the German bank that serves as Trump’s biggest lender, was forced to submit documents about its client relationship with the president and some of his family members, who are also Deutsche clients, after Mueller issued the bank with a subpoena for information, according to multiple media reports. The news was first reported by Handelsblatt, the German newspaper.