Soto began his tenure as mayor of Canóvanas when he was elected at the
1992 Puerto Rican general election. He beat candidates Estéban Meléndez (
PPD) and Eduardo Betancourt (
PIP) to win the seat. He was reelected five consecutive times (1996, 2000, 2004, 2008, and 2012) making him one of the longest tenured mayors in the island. During his time in office, Soto became known for his fervent belief in the existence of the
Chupacabra. Since the 1990s, Soto claimed that the mythical creature roamed the terrains of Canóvanas. Ever since, he organized various expeditions to search for it, without success. In 2014, Soto announced his intention to retire from politics. He was succeeded as mayor by his daughter,
Lornna Soto. However, the next year, Soto announced he would aspire to a seat in the
Senate of Puerto Rico, but he was defeated in the
2016 primaries. ==Personal life and death==