MANAMA -- US Secretary of State Marco Rubio wrapped up a three-day swing through the Persian Gulf on June 25 with messages aimed at reassuring Washington's allies in the region, reaffirming an intention to pursue diplomacy with Iran, and insisting on freedom of navigation through the Strait of Hormuz. Speaking after a ministerial gathering of the Gulf Cooperation Council (GCC) in Bahrain, Rubio sought to calm anx