In February, an ECJ advocate general said this was in line with the aims of the EU single market - a border-free zone for goods and services.

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Over the past year the Danish, French and Italian governments have rolled back the Schengen passport-free zone and reintroduced limited border controls.

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Mr Tusk just about accuses his fellow EU leaders of hypocrisy for talking of integration and yet undoing the Schengen passport-free zone by reimposing some border controls.

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