Romanians have been casting votes to decide whether their unpopular president should be forced to leave office. Traian Basescu's rivals accuse him of abusing the constitution.
The left-leaning government of Prime Minister Victor Ponta initiated the referendum to oust the president, arguing that he overstepped his powers.
Polls indicate that Basescu's only hope to stay in office is low voter turnout. More than half of the country's 18 million voters must cast ballots for the referendum to be valid.
The European Union has criticized the government for going forward with the referendum, saying it undermines the rule of law in Romania.
Polling stations close at 10 p.m. local time. Results are expected on Monday.
ncy/ (dpa, Reuters, AP, AFP)