HDSSB leader Vladimir Sisljagic told a news conference in Osijek that this parliamentary party was against the government's motion to that effect.
So far 84 percent of the signatures needed to initiate the procedure for calling the referendum have been collected, union leader Ozren Matijasevic said in Sinj earlier today.
Apart from the HDSSB, other parliamentary parties such as the Social Democratic Party, the Labour Party and the Pensioners' Party have also supported the union drive.