Ponta, who is accused of falsifying documents, tax evasion and money laundering, refused to step down as head of the Cabinet last week, saying only the Parliament may decide whether or not he should be dismissed from office.
Ponta’s Social Democratic Party and its allies hold majority in Parliament.
President Klaus Iohannis said the Parliament should not obstruct justice, adding it is unfortunate that the ruling coalition chose to shield the prime minister from investigation.