President Evo Morales entered the second day of a hunger strike to pressure lawmakers to pass a controversial electoral law that was only partially approved a day earlier.
Opposition lawmakers have sought to block the election law, which is seen as likely to help him in the December general election by assigning more seats to poor, rural areas where he is widely popular.
"It's impossible to end the hunger strike. First they have to follow the people's will," Morales said, speaking of the opposition, after he and several indigenous and labor leaders spent the night on mattresses on the floor of the presidential palace.
Morales, Bolivia's first indigenous president, has not eaten anything for more than 24 hours but is drinking water, a spokesperson said.