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The Trump administration's crackdown on immigration is also curbing population growth. That makes it harder to find workers, but it also means fewer are needed.
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He noted that tech companies are "already under that duty when it comes to terrorist material so it can be done. It's a known mechanism," adding that "we need to pursue this with the same vigour".
More than 8,000 people have so far submitted evidence, with Baroness Amos meeting more than 400 families.
Government racks up £100m bill responding to Covid inquiry