Bolivia's interim President Eduardo Rodriguez warned on Friday there would be a "dangerous power vacuum" if elections were not held on Dec. 4, Reuters reported. There have been a series of legal challenges to the elections to try to prevent indigenous leader Evo Morales from winning, as polls suggest he is set to do. "The president has a defined time span," Rodriguez told journalists during a summit of Latin American and Iberian leaders in Spain. "If we cross that period, it could generate risk, a dangerous power vacuum." Rodriguez became interim president, for 180 days, earlier this year after former president Carlos Mesa resigned in the face of mass protests. Rodriguez said he hoped Bolivia's Congress would make a definite decision for the elections to go ahead soon.