Democrats are preparing an investigation into Trump's diesel deal with Putin. Axios The October 24 letter was received by six major banks, including J. P Morgan, Bank of America and Goldman Sachs, and the Port Authorities of Texas and New York. The authors request to retain contracts, shipping documents, vessel information, and correspondence with suppliers, brokers, and US officials. Approval is expected by Wednesday, October 28. The investigation will be a top priority for Democrats if they win control of one or both houses of Congress after the Nov. 3 election.