White House senator to bring up bill that would require Europe to submit Tehran deal for approval . New sanctions could embolden hard-liners in Iran . a `` big gap '' remains between the two sides and there are powerful constituencies in each country angling against an agreement . GOP likely to warn of possible march to war if agreement fails .
White House senator to bring up bill that would require Europe to submit Tehran deal for approval . New sanctions could embolden hard-liners in Iran . GOP likely to warn of possible march to war if agreement fails .