LONDON: Prime Minister David Cameron says migrants from Europe will have to leave Britain if they don’t get a job within six months, and must work for four years before receiving some benefits — moves he hopes will defuse criticism over his immigration policies.

He said Friday that freedom of movement within Europe is not “an unqualified right.”

“If an EU job seeker has not found work within six months, they will be required to leave,” he said.

Cameron hinted he might recommend a British exit from the European Union if it stops him restricting EU migrants’ access to UK welfare benefits, but said he was confident it would not come to that.

In a speech designed to breathe new life into his campaign for re-election next May, Cameron set out a detailed blueprint for limiting EU migrants’ access to benefits like tax credits and housing.

In a demand likely to meet fierce resistance from EU leaders such as German Chancellor Angela Merkel, Cameron said his proposals would require changes to EU treaties, which enshrine freedom of movement as a fundamental principle.

If re-elected, Cameron has promised to renegotiate Britain’s ties with the EU before holding a referendum in 2017 on whether to stay in or leave the 28-nation union. While making it clear he thought that renegotiation would succeed, he dropped his strongest hint yet that he may campaign for Britain to quit the bloc if he fails.

“I will negotiate a cut to EU migration and make welfare reform an absolute requirement in renegotiation,” Cameron said.

“If I succeed in the negotiation that I am going to undertake, I will, as I have said, campaign to keep this country in a reformed EU. (But) if our concerns fall on deaf ears and we cannot put our relationship with the EU on a better footing, then of course I rule nothing out.”

Opinion polls show immigration is the number one concern of British voters, many of whom believe it is posing intolerable strain on schools, hospitals and the welfare system. Defenders of the system say the majority of those arriving are young workers, often from Eastern Europe, who find jobs, pay taxes and make limited demands on welfare.

“Our concerns are not outlandish or unreasonable,” said Cameron. We deserve to be heard, and we must be heard. Not only for Britain’s sake, but for the rest of Europe.

“Because what is happening in Britain is not unique to Britain. Across the European Union, issues of migration are causing real concern.”

He said he wanted employed EU migrants to wait four years before being allowed to access welfare benefits, and for unemployed EU migrants not to be eligible for any help.

In Brussels, a European Commission spokesman said: “These are UK ideas and they are part of the debate. They will have to be discussed without drama and should be discussed calmly and carefully. It is up to national lawmakers to fight against abuses of the system and EU law allows for this.”

Anticipating an anxious reaction from some EU partners, Cameron phoned Polish Prime Minister Ewa Kopacz beforehand to reassure her any measures would not discriminate against Poles.