Venezuela opposition puts pressure on President Maduro
In a special session, congressmen said he had broken constitutional law and carried out a coup d'etat.
The move came days after officials blocked a popular vote on removing Mr Maduro from power.
Ruling party officials accuse the opposition of fraud while collecting signatures needed for the referendum.
During the rowdy session in Congress, which was interrupted by government supporters bursting into the chamber, the opposition majority leader Julio Borges accused Mr Maduro of breaking the law by not allowing the popular vote to take place.
"It is a political and legal trial against President Nicolas Maduro to see what responsibility he has in the constitutional rupture that has broken democracy, human rights and the future of the country."
Observers say the measures are unlikely to get any traction because, although the Congress is dominated by opposition parties, the government and the Supreme Court have systematically undermined the legislature.
Ruling party officials have accused the opposition of fraud and have linked party members to alleged foreign forces and a business establishment which they say is trying to bring down the left-wing government.
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