A day after Maduro announced his latest drastic measures to tackle power shortages in the recession-hit country, the opposition was gathering signatures for an official petition to launch a referendum yesterday.
Citizens queued up to sign, voicing anger at Maduro over a crisis that has led to power outages for four hours a day in most of the country, exacerbating an already disastrous economic implosion.
"I came to sign it to end this anarchy," said Miriam Leal, 54, in eastern Caracas.
The International Monetary Fund issued a stark warning on the state of Venezuela's oil-dependent economy, hit hard by the collapse in global crude prices.
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"The economic situation is not sustainable in the medium term," said Alejandro Werner, director of the IMF's Western Hemisphere department.
He warned the economy would shrink eight percent this year and inflation would exceed 700 per cent.
The crisis is taking an increasingly heavy toll on weary Venezuelans.
After daily power-cuts were imposed on Monday, looting was reported in several places including the country's second-biggest city, Maracaibo.
Isolated incidents were also reported in the capital Caracas.
Maduro on Tuesday announced enforced leave for public sector employees three workdays a week for at least two weeks in a bid to slash electricity use.
His Vice President Aristobulo Isturiz also said primary and high schools would be closed on Fridays.
That followed the start of daily four-hour electricity blackouts in several states on Monday, which Maduro said would last 40 days.