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By Andrew Osborn LONDON (Reuters) - British Prime Minister David Cameron said on Wednesday he was rushing out regulations to stop EU migrants being able to claim welfare benefits as soon as they arrive amid fears there will be an influx of Romanian and Bulgarian workers after January 1. Cameron is under pressure to act on the issue, with his Conservative party trailing in opinion polls ahead of a 2015 election and surveys showing most Britons don't want the labour market to be further opened up to east European workers. Anxious not to be outflanked by the anti-immigration UK Independence Party (UKIP), he has said he shares public concerns about restrictions on Romanians and Bulgarians working in Britain being lifted at the end of this year. On Wednesday, he said he was bringing forward to January 1 a previously announced measure that will force European Union migrants to wait three months before they can apply for welfare benefits.