Juan Gerardo Guaidó Márquez is a Venezuelan politician, previous member of the social-democratic Popular Will party and federal deputy to the National Assembly representing the state of Vargas. On 23 January 2019, Guaidó and the National Assembly declared that he was acting president of Venezuela, starting the Venezuelan presidential crisis by challenging Nicolás Maduro's presidency. In December 2022, opposition parties voted to dissolve the Guaidó interim government, and the dissolution occurred on 5 January 2023, ending Guaidó's presidential claim.