Labour claimed cuts to child benefit that came into effect at midnight, combined with a three-year benefits and tax credits squeeze, was a "huge assault" on millions of working families.
Research compiled by the Commons library for the shadow equalities minister Yvette Cooper shows 4.6 million women who receive child tax credit directly will be hit by a cap on welfare increases, according to the Guardian.
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The letter was signed by the CBI, British Chambers of Commerce, the EEF, the Institute of Directors and the Federation of Small Businesses.
A spokesperson said Rory Stewart's remarks were in line with the British government’s stated position.
The minister's intervention will come a week after Trump decertified the landmark agreement claiming it was not in the US national interest.