The U.S. Senator representing the home state of Goodyear Tire & Rubber Company has written to the tyre maker, imploring it to improve the renumeration and treatment it gives workers at its plant in San Luis Potosí, Mexico. Sherrod Brown, Senator for Ohio, urged Richard Kramer, Goodyear’s chairman, president and chief executive officer, to “take immediate steps” to improve both. He also criticised Goodyear’s decision to recently prevent Members of the United States Congress from touring the facility.