 Complete the following phrase:  On 9 October 2013, he returned the mandate to the Democratic Party of Serbia, but remained the partys vice president. Shortly after, he resigned from all positions in the party, because he believed that the party leadership was not doing everything necessary to preserve Kosovo and Metohija as a part of Serbia, and that the attitude of the party towards the government was too mild. Above all, he believed that it was necessary to gather all patriotic forces into one coalition, which would consist of both political organizations and intellectuals and prominent public figures, and which would be a necessary opposition to the Serbian political system within which, with the Serbian Progressive Party coming to power, consensus was reached on the surrender of Kosovo and Metohija. He has written and spoken about it in public since the very signing of the 