WASHINGTON (Reuters) -U.S. and European Union negotiators failed to reach deals to settle longstanding trade disputes in time for a summit at the White House on Friday, but Washington said it would keep providing some relief from tariffs on steel and aluminum, and both sides said talks would continue. Senior U.S. administration officials said they made significant progress on the trade issues but more work was needed to reach deals on energy subsides and the steel and aluminum market. U.S. Presi