CARACAS, Venezuela –  Venezuelan President Hugo Chavez isn't naming a fill-in as he prepares to head to Cuba for surgery to remove a potentially cancerous tumor.

The nation's congress on Thursday unanimously approved permission for Chavez to leave -- a formality required by the nation's constitution. Pro-Chavez lawmakers scoffed at opposition suggestions that Chavez might need the vice president to temporarily assume office.

Vice President Elias Jaua says Chavez is fully capable of continuing his duties.
Chavez is expected to travel to Cuba on Friday or Saturday.