(CNN)  -- Bolivian President Evo Morales plans to sign legislation Friday scheduling a May 4 referendum on a new constitution, the Bolivian Information Agency reported.



Bolivians celebrate Thursday in La Paz after Congress decides to call for a referendum on a new constitution.



The move comes after the Bolivian Congress decided Thursday in a raucous session to let people nationwide vote on the controversial plans.



The proposed constitution would strengthen the country's indigenous majority but has faced fierce opposition from nonindigenous Bolivians, including those in four provinces whose governors have declared autonomy.



Hundreds jammed streets Thursday outside the congressional building in La Paz to prevent opposition legislators from entering. Video footage broadcast on CNN en Español showed people pushing, shoving and hitting others.  Watch as the crowds block the opposition »



Congress made its decision to hold a referendum "with a reduced presence of opposition lawmakers," the Bolivian news agency said.



Opposition legislators decried the move as "illegal," the agency said, but supporters of Morales welcomed it.



"Now it is the Bolivian people who will decide with their vote whether to approve or reject the new constitution," said Vice President Alvaro Garcia Linera, according to the Bolivian Information Agency. E-mail to a friend
What will strengthen Bolivia's majority? who is set to sign the legislation? What did the Bolivian Congress decide on May 4? Who decrys the move as illegal? what did congress decide? what would strengthen bolivia's majority? Who will sign the legislation? What would the proposed constitution do?
The proposed constitution Bolivian President Evo Morales call for a referendum Opposition legislators call for a referendum on a new constitution. The proposed constitution Bolivian President Evo Morales strengthen the country's indigenous majority
question: What will strengthen Bolivia's majority?, answer: The proposed constitution | question: who is set to sign the legislation?, answer: Bolivian President Evo Morales | question: What did the Bolivian Congress decide on May 4?, answer: call for a referendum | question: Who decrys the move as illegal?, answer: Opposition legislators | question: what did congress decide?, answer: call for a referendum on a new constitution. | question: what would strengthen bolivia's majority?, answer: The proposed constitution | question: Who will sign the legislation?, answer: Bolivian President Evo Morales | question: What would the proposed constitution do?, answer: strengthen the country's indigenous majority