Venezuela's Juan Guaido urges supporters to protest on Monday

CARACAS, Venezuela -- Venezuelan opposition leader Juan Guaido has called for nationwide demonstrations on Monday to coincide with his planned return to the country. Guaido on Sunday tweeted that Venezuelans should monitor his official announcements and that he would provide details about meeting points for supporters. He said they should gather across the country at 11 a.m. The leader of the National Assembly who has declared himself president also tweeted a photo of himself walking across an a