as russia tries to extend influence in the middle east. i'll be joined by former u.s. ambassador to saudi arabia, robert jordan. fox news middle east and terrorism expert dr. walid phares. our top story tonight, the republican rebellion and effort to stop the president's nuclear deal with iran, as of now, republicans in congress are working on a plan they believe will have the best chance of stopping the deal. as the republicans work into the night on that, two rivals for the republican presidential nomination, they met in washington to attack the agreement. donald trump and senator ted cruz headlined a rally warning of catastrophic consequences if the deal is passed. fox news chief political correspondent carl cameron with our report. >> reporter: in 90-degree heat, donald trump took the stage at a capitol hill protest against the iran nuclear deal sponsored by the tea party patriots, the zionist organization of america and the center for security policy. thousands turned out.