washington two republican u.s. senators oppose nuclear agreement iran introduce bill wednesday would keep iran gain even indirect access u.s. financial system use u.s. dollars business transactions measure introduce senators mark kirk marco rubio come amid media report u.s. officials move toward allow transactions president barack obama deny plan legislation would prohibit president issue license conduct offshore u.s. dollar clear system iranian transactions provide system u.s. dollars also would impose secondary sanction financial institution find participate offshore dollar clear system iran state department spokesman mark toner acknowledge unite state advise bank businesses conduct business tehran without run afoul u.s. authorities involve convert money dollars bank want violate exist sanction say allow certain condition business iran consider obligation counsel them along obama fellow democrats congressional republicans unanimously oppose deal announce july iran agree scale back nuclear program exchange sanction relief several lawmakers work legislation since keep tight control iran especially repeat ballistic missile test since late last year u.s. representative ed royce republican chairman house foreign affairs committee publish column washington post wednesday say obama eager preserve signature foreign policy agreement would consider measure would let iran launder dollars administration look way issue particularly potent u.s. election year americans pick new president every member house one-third senators re-election three remain republican presidential candidates vow tear back away nuclear deal obama administration officials say would calamitous rubio suspend 2016 presidential campaign last month kirk senate re-election race see one year competitive republicans offer bill block potential iran dollar use