washington republican u.s. senator rob portman thursday say oppose trans-pacific partnership trade deal present form deal significant blow pact day officials 12 countries sign portman ohio say pacific trade deal fail meet need state workers lack enforceable provision fight currency manipulation new less-stringent country-of-origin rule auto part support tpp current form provide level play field portman say statement approval trade pact top priority president barack obama year final year office face stiff opposition many fellow democrats congress meanwhile republicans begin voice concern specific provision indicate rush bring deal vote besides insist portion sweep pact renegotiate republicans worry bring tpp vote november elections could hurt chance incumbents run swing state congressional district portman seek second term industrial state many workers blame job losses previous trade deal north american free trade agreement nafta expect face stiff challenge former democratic governor ted strickland 12-nation deal would liberalize trade chile japan represent 40 percent world economy republican senator portman oppose tpp trade deal present form