Speaking to the press, Karamarko said the coalition was falling apart because the only thing its parties had in common was the desire for power. He said this policy had led "to a complete disaster, with their giving up on each other."
Karamarko described as a tragedy the coalition's claims that its election platform had failed.
Asked if a government reshuffle would be enough or if an early election should be called, he said the HDZ's position was that it would not insist on early elections before Croatia's European Union accession, scheduled for July 1.
He said a reshuffle would not help, accusing the government of "ignorance, incompetence, intolerance and overbearing."
Karamarko does not think the coalition would make it to the end of its four-year term.
Commenting on Ostojic's resignation, the parliamentary Croatian Party of Rights Dr. Ante Starcevic (HSP AS) said in a statement the incumbent government was "a government of the suitable and not the capable" and that an early parliamentary election should be called in the autumn, after the Zoran Milanovic Cabinet organised European Parliament and local elections and completed Croatia's EU accession.
The party said the government had no vision of how to revive the economy and that if the IDS left the ruling coalition, the potential of the senior partner, the Social Democratic Party, as the leading political force would be diminished.