Venezuela’s Supreme Court banned opposition leader Juan Guaido from leaving the country and froze his bank accounts at a session in Caracas on Tuesday.
The head of the National Assembly is “prohibited from leaving the country without authorisation” until an investigation is completed, court president Maikel Moreno said.
The Supreme Court, which is loyal to the Venezuelan government, approved the “precautionary” measures proposed by Attorney-General Tarek William Saab.
Guaido has sought to unseat current Venezuelan leader Nicolas Maduro, declaring himself as interim president.
The US and a majority of Latin America countries have already recognised the opposition leader.
Russia, China, Mexico and Turkey have publicly backed Maduro.