Analysts and western leaders believe Iran will increase support of militia groups despite deal between US and Tehran As Marco Rubio ended his brief visit to the Middle East on Friday, he sought to cast in the best possible light his discussions with leaders of the Gulf states. Those leaders are deeply anxious that the deal agreed earlier this month between Iran and the US fails to address their worries about continued Iranian efforts to project power and influence throughout the region. “They’ve shared with us some very concrete concerns,” the US secretary of state admitted, and insisted that any definitive agreement will require Tehran to not only restrict its nuclear programme but also halt its support of Hamas in Gaza, Hezbollah in Lebanon, militia in Iraq and the Houthis in Yemen.