The plan announced by National Assembly President Julio Borges is a dramatic escalation of the opposition's effort to fight Maduro's proposal.
Borges said that the vote would be held July 16 two weeks before Maduro is asking Venezuelans to go to the polls to choose delegates for a special assembly to overhaul the charter.
"We want the people to decide," Borges told a crowd of opposition leaders gathered in eastern Caracas. "Today we're united in a single bloc to defend our constitution."
Polls show that barely 20 percent of Venezuelans favor rewriting the late Hugo Chavez's 1999 constitution about the same level of support for Maduro.
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The opposition coalition has decided to boycott the polling, arguing that rules to choose delegates to the proposed assembly are undemocratic and heavily favor the government.
Once seated, the constitutional assembly will have vast powers to reshape Venezuela's institutions, and some in the opposition fear it could convert Venezuela into a Cuba-styled socialist system in which open elections would cease to exist.
"Even if only one, two or three Venezuelans vote, it's still an election and the opposition will be left there squealing," socialist party leader Diosdado Cabello said last week on state TV.
Maduro has vowed to present any new constitution for a ratification vote, but the opposition argues that a referendum is required just to call a constitutional assembly. Both times Chavez attempted to rewrite the constitution, in 1999 and 2007, he sought a popular mandate before embarking on the process.
Opposition lawmakers greeted her with enthusiastic applause yesterday when she appeared at the chamber for special assembly to reappoint her deputy, who was removed last week by the government-stacked supreme court in apparent violation of the constitution.
"My role as chief prosecutor requires that I assume the first line of defense of our republican state," she said in a video address to the nation yesterday.
She said that "in the face of the attacks and threats hanging over the country,' her agency is "perhaps one of the few democratic windows that are left open in the country" and said it "won't be intimidated or give up the rights and freedoms of Venezuelans without a fight."
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