Rome, April 25 - Democratic Party deputy head Enrico Letta said Thursday that he is not giving up on working with the anti-establishment 5-Star Movement (M5S). The M5S has refused to cooperate with other parties, arguing that would only perpetuate a dysfunctional political system. But Letta brushed that aside as he met Thursday with representatives of various parties to try to form a new Italian government. "I have not yet dropped my reservations," he said, political jargon for being sure he can tell President Giorgio Napolitano a government can be formed. "There are difficulties," said Letta. "We are going through a terra incognita," but a stalemate would be unacceptable, he added. Still, M5S whips have rejected Letta's pleas, saying that they saw no sign of "real change".