In 1983, opposition leader Benigno "Ninoy" Aquino Jr. was assassinated at Manila International Airport upon his return to the Philippines after a long period of exile in the United States. This coalesced popular dissatisfaction with Marcos and began a series of events, including pressure from the United States, that culminated in a snap presidential election on February 7, 1986. The opposition united under Aquino's widow, Corazon Aquino, and Salvador Laurel, head of the United Nationalists Democratic Organizations (UNIDO). The election was marred by widespread reports of violence and tampering with results by both sides.