Greek Prime Minister Alexis Tsipras on Sunday said he would call a confidence vote in his government after his coalition ally quit, leaving him bereft of a parliamentary majority and raising the possibility of snap elections, Reuters reported.

Earlier, Greece’s right-wing defense minister resigned in protest at a deal ending a long running dispute with Macedonia over its name, saying he was taking his other six ministers in cabinet with him.

“I have taken my decision and have informed the president of parliament that we will immediately move to the process outlined by the constitution for the renewal of the confidence in my government,” Tsipras told journalists.

The confidence vote is expected to take place later this week and parliamentary speaker Nikos Voutsis proposed Jan. 16. Kammenos said he would not support Tsipras in the vote.