Hungary's prime minister has rejected criticism from the European Union over changes to the country's constitution. The EU is among those who fear the changes threaten Hungary's democracy.

Prime Minister Viktor Orban responded to a reporter's question in Brussels on Thursday by denying that the constitutional amendments were anti-democratic or contrary to EU regulations.

"Who is able to present even one single point of evidence, facts, may I say, which could be the basis for any argument that what we are doing is against democracy?" the conservative politician said. "Without facts there is no sense of any general political discussion," he added.