French President Emmanuel Macron has called for reform of the Schengen system, which currently involves 26 countries: 22 EU countries, plus non-EU Norway, Switzerland, Iceland and Liechtenstein.
The town of Pettigo is right on the line between the Republic of Ireland and Northern Ireland. Border controls are a thing of the past. Brexit could change this, with dramatic consequences.
EU and Britain negotiators have jointly agreed a political declaration that sets out the aspirations of both sides in their relationship after the divorce. This is what we know about the declaration.
The main sticking point in Brexit negotiations is how to keep Britain's land border with the Republic of Ireland open after it leaves the European Union.
The decision is based on the argument that it is still too easy for migrants to move between EU countries and that external migration controls for the bloc are lacking.
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