US Secretary of State Marco Rubio said Thursday that relations between the United States and its Gulf Arab partners are rock solid, despite fears by some of them that they might be left out of discussions aimed at ending the war with Iran. Rubio used a three-day, three-nation trip to the United Arab Emirates, Kuwait and Bahrain this week to try to convince all the members of the Gulf Cooperation Council that the Trump administration does indeed have their backs in negotiations to end the war President Donald Trump and Israel launched on Feb. 28.