TRIPOLI, Lebanon— When Sahar, an interior designer woke up on Sunday morning she saw that the streets in her hometown, Lebanon's second largest city, had overnight been decorated with dozens of green and white Saudi Arabian flags. While she'd been sleeping, another Tripolitan, Omar, had met up with friends and other locals in the predominantly Sunni city's main square. Their mission for the evening? To make a clear signal that the Sunnis of Tripoli are aligned with Saudi Arabia and not Iran, the primary backer of Shiite armed group Hezbollah, a U.S.