The Turkish prime minister, Recep Tayyip Erdogan, said Ankara will not agree to any new conditions for EU membership, adding that Turkey expects "honest politics" as it begins negotiations to join the regional bloc.
Tough membership conditions have already been imposed such as the recognition of Cyprus before talks begin in October, progress must be shown on Kurdish rights, improvement in the economy and the limiting of the military's influence in politics. Ankara is also expected to treat ethnic and religious minorities equally and implement penal code reforms.
But many European voters are balking at letting in the poor, predominantly Muslim country of 70 million people, a decision which would extend the EU's borders to Syria and Iran.
EU Commission President Jose Manuel Barroso said this week that the bloc should have an open debate about Turkey's candidacy. The country is scheduled to start membership negotiations with the EU on October 3.
"Turkey is not ... renegotiating anything," Erdogan told reporters. "If you impose new things on countries from one day to the next, especially at a time when negotiations are about to start, that would not be right," he added. "We are used to honest politics, that's what we expect and want."
Concerns about Turkey's membership were highlighted by the recent rejection of the EU's proposed constitution by French and Dutch voters, many of whom cited Turkey's bid as the reason they cast ballots against the charter.
Erdogan praised British Prime Minister Tony Blair, who this week urged the EU to continue expanding. Blair warned that shutting the door to new members would give rise to nationalism and xenophobia in Europe.
"In politics, I like those who have a backbone ... I don't like the rest," Erdogan said.