Croatia's ruling HDZ party expelled former Prime Minister Ivo Sanader on Monday in an attempt to hamper his come-back into politics.
Emerging visibly excited from a 10-hour meeting of the HDZ leadership, Kosor told reporters:
"The party leadership has proposed and the presidency accepted to erase Ivo Sanader from HDZ membership,"
Sanader unexpectedly quit as prime minister in July without giving an explanation.
In a move media described as a 'party coup', Sanader called a news conference on Sunday. Criticizing Kosor and the HDZ leadership, he said his withdrawal from politics had been a mistake and declared he would play a more active political role.
But barely 24 hours later, his party had expelled him. It was not immediately clear if Sanader would seek to become an independent parliament member and win over some HDZ deputies, which might threaten Kosor's ruling conservative coalition.
Kosor said she was not afraid this might happen although "he has a right to return to parliament".