Lawmakers loyal to Venezuelan President Nicolas Maduro stripped Juan Guaido of immunity Tuesday, paving the way for the opposition leader’s prosecution and potential arrest for supposedly violating the constitution when he declared himself interim president.

Guaido has embarked on an international campaign to topple the president’s socialist administration amid deepening social unrest in the country plagued by nearly a month of power outages.

He declared himself Venezuela’s interim president in January, and vowed to overthrow Maduro. So far, however, Maduro has avoided jailing the man that the administration of U.S. President Donald Trump and roughly 50 other nations recognize as Venezuela’s legitimate leader.

Tuesday night’s vote was unanimous. Constituent Assembly president and socialist party boss Diosdado Cabello accused the opposition of naively inviting a foreign invasion and of inciting a civil war.

The Constitution guarantees immunity for elected officials, and says that in order to withdraw immunity the accused lawmaker must be given a preliminary hearing before the Supreme Court.

Earlier Tuesday, Guaido dismissed the Maduro-stacked high court and Constituent Assembly as illegitimate, and continued his calls for Maduro to step down.“This is not even persecution,” Gaido said before the vote. “This is inquisition.” Guaido has come under increasing pressure in recent weeks.

Officials jailed his chief of staff, Roberto Marrero, accused of involvement in a “terrorist” scheme to overthrow the government. Maduro’s government also barred Guaido from holding public office for 15 years for allegedly hiding or falsifying data in his sworn statement of assets.

The opposition leader has drawn masses of Venezuelans into the streets and garnered broad international support, demanding Maduro give up rule of the crisis-wracked nation.