washington republicans u.s. congress long staunch opponents iran nuclear deal may best hope preserve president donald trump decline friday certify tehran comply pact every republican congress oppose international accord reach democratic former president barack obama two years ago join several democrats nearly pass legislation kill deal iran agree curb dispute nuclear program exchange sanction relief however agreement place strongly support co-signers britain france germany russia china many republicans still abhor pact nevertheless want blow fear would erode u.s. credibility want find ways clamp tehran meet officials trump obama administrations european diplomats among prepare strategies save include push tough inspections change law require trump certify tehran compliance set new sanction iran non-nuclear activities flaw deal believe must enforce hell representative ed royce republican chairman house foreign affairs committee say wednesday friday trump expect unveil broad strategy iran include announce decertify agreement ahead oct. 15 deadline although could always change mind republican president go ahead would open 60-day window congress could reimpose sanction step toward unravel deal however trump expect call lawmakers revive sanction stop short recommend give republicans room stand pat daniel kurtzer former u.s. ambassador israel professor princeton university say political pressure could intense onslaught phone call letter visit senators something iran say israeli prime minister benjamin netanyahu urge washington either fix iran deal nix it wednesday h.r mcmaster trump national security adviser discuss iran republican chairmen house representatives national security committees thursday intelligence officials schedule classify brief members house foreign affairs committee senate foreign relations committee chairman bob corker key player iran debate suggest change iran review act co-author eliminate requirement trump recertify iran compliance deal every 90 days several congressional source say trump pledge campaign rip iran deal recertified twice since take office january hat twitter feud erupt week trump corker could complicate efforts influential republican broke deal would likely require democratic republican support congress administration need page major breakdown work relationship one key republicans hill work democrats president iran policy bode poorly say elizabeth rosenberg former treasury department official center new american security win conservative republicans iran hawk corker leaders consider propose sanction iran non-nuclear activities broad inspections particularly iranian military facilities thursday house foreign affairs committee approve sanction target iran ballistic missiles development could come vote full house well end 60 days congress react trump announcement iran deal 's foes u.s. congress may unlikely saviors