Exclusive: Democrats lay groundwork to probe Trump's diesel deal

Top Democrats poised for powerful roles next year are demanding that major banks and ports preserve any records they have tied to potential imports or other deals involving Russian diesel . Why it matters: Probing President Trump's agreement with Moscow will be a priority if Democrats regain control of either or both chambers of Congress. The new demand shows that inquiries will extend beyond the White House and into C-suites. Driving the news: "[A]ny importation of Russian diesel into the U.S. raises significant legal questions and may be subject to legal action, as well as congressional investigations," a new letter obtained by Axios states. It's signed by Sens. Chris Coons (D-Del.), Elizabeth Warren (D-Mass.), Ron Wyden (D-Ore.), and Sheldon Whitehouse (D-R.I.). They're in line to lead the powerful Foreign Relations, Banking, Finance and Judiciary Committees, respectively, if Democrats regain the Senate. Rep. Greg Meeks (D-N.Y.), who's in line for the Foreign Affairs Committee gavel if House control changes, also signed. It's led by Sen. Jeanne Shaheen (D-N.H.), the top Foreign Relations Democrat who is not seeking reelection. Sen. Thom Tillis (R-N.C.), who is also retiring, signed as well. State of play: The Wall Street recipients of Saturday's letter are J.P. Morgan, Bank of America, Citi, Wells Fargo, Goldman Sachs and Morgan Stanley. The same letter went to port authorities for the ports of Houston, Beaumont, and Corpus Christi, Texas, and New York/New Jersey. Catch up quick: Earlier this month Trump claimed an agreement to bring escalating Russian exports to global and U.S. markets, and the Treasury Department waived sanctions to help enable it. Friction point: The lawmakers and other critics say it runs afoul of a bipartisan 2022 law barring imports of Russian oil, gas, and petroleum products. "The potential arrangement to import Russian diesel also raises significant national security concerns, given that it would finance Russia's brutal and illegal war ag