Romanian Social Democrat Prime Minister Viorica Dancila on Saturday threatened to take centre-right President Klaus Iohannis to court over his attacks on the government and refusal to approve ministerial appointments.
"We shall seek justice," Prime Minister Viorica Dancila told a party meeting in Constanta on the Black Sea.
"It's easy to label people -- but you have to have proof. I have never been caught up in a corruption scandal. And if the ministers are not nominated we shall go to the constitutional court."
With the ALDE centre-left liberals having left the government, Dancila wants to replace their ministers by members of her own party prior to a parliamentary vote of confidence.
President Iohannis, seeking re-election in three months, accused Dancila's social democrats as well as ALDE of holding voters in contempt "which should surprise nobody.
"On the contrary, it is the logical result of two-and-a-half years of chaotic, incompetent and corrupt governance."
Iohannis is due to discuss the impasse Monday with Dancila by telephone as the government struggles over controversial judicial reforms she says will remedy abuses but which Brussels views with alarm as eroding basic freedoms.
Critics say the proposed reforms would weaken the rule of law and the fight against corruption.
As well as suffering defeat in European elections earlier this year, the social democrats have been badly hit by the three-and-a-half year jail term handed down to former party leader Liviu Dragnea for corruption.