British Prime Minister David Cameron says his country might be forced to leave the EU because of the eurozone and refugee crises, urging the bloc to implement serious "reforms."

What Cameron calls reforms are actually a list of demands which include his bid to stop EU asylum seekers from claiming benefits in the UK for four years.

Cameron called the "reforms," which he put forth to the EU in a letter last month, “the concerns of the British people.”

“I want Britain to stay in a reformed European Union. That is why I am seeking important reforms to address the concerns of the British people about the status quo,” he told a Wednesday press conference during a visit to the Romanian capital, Bucharest.

Donald Tusk, the president of the European Council, has said EU countries are against Cameron's plans and warned that the British PM “will not be satisfied one hundred per cent” even after his demands are met.

Cameron has promised to hold a referendum on whether or not Britons want their country to stay in the EU by the end of 2017 if the bloc fails to meet his demands.

On Monday, Tusk said he expects an agreement at an EU summit in February to keep Britain in the bloc, despite a lack of consensus over the demand on migrant benefits.

In a letter to EU leaders, Tusk warned that uncertainty over Britain’s potential exit from the EU, or a Brexit, was destabilizing the 28-nation bloc.

EU membership has long been a contentious topic in Britain. Eurosceptics, who believe the UK would be better off outside the political and economic union, seek the UK’s withdrawal from the EU.

A survey published by The Independent last month indicated that a 52% majority of Britons favor an exit from the EU.