Washington, Oct. 26 -- Senior US Democrats are demanding that major banks and port authorities preserve records relating to potential imports and other transactions involving Russian diesel, warning that the deals could trigger legal action and congressional investigations if the party regains control of either chamber of Congress.

According to a letter obtained by Axios, "any importation of Russian diesel into the US raises significant legal questions and may be subject to legal action, as well as congressional investigations".

The letter was signed by Senators Chris Coons, Elizabeth Warren, Ron Wyden and Sheldon Whitehouse, who are in line to lead the Senate Foreign Relations, Banking, Finance and Judiciary committees, respectively, if ...