Yikes. As if the Arab rivalries were not complex enough.

The U.S. just made best friends of Saudi Arabia, who probably spearheaded the action. "The chief worry among them is the Muslim Brotherhood, a Sunni Islamist political group outlawed by both Saudi Arabia and the UAE as it challenges the nations’ hereditary rule." 

Meanwhile, the U.S. has major bases in both Qatar and Bahrain, now on opposite sides of this dispute. And Trump can't just sign an Executive Order to settle the issues.