Venezuelans are scheduled to elect governors and new Congress officials this Sunday. Most polls predict low turnout due to a lack of faith in the electoral system.

Juan Pablo Guanipa, a well-known Venezuelan opposition politician, was arrested on Friday on charges of conspiring to sabotage upcoming parliamentary and regional elections and leading a “terrorist network.

The arrest of Guanipa, a 60-year-old former MP and close ally of opposition leader Maria Corina Machado, comes amid rising tensions ahead of Sunday’s election.