Labour's shadow immigration minister said it was important to ask questions about the impact of foreign workers on the UK labour market, and address the concerns of UK residents and citizens.
He said there were questions of fairness to be asked about the hiring practises of British firms that specifically target foreign workers, and singled out Next and their association with an agency that targets Polish staff though its Polish language (only) website.
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MPs have reacted to the news.
It comes after House Republican leaders postponed voting on a compromise immigration measure.
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