Freedom of movement must remain in place until the UK exits the European Union, the European Parliament has reportedly decided as it prepares for Theresa May to trigger Article 50 tomorrow.
The issue is a red line in Brexit negotiations and is thought to be at odds with the UK Government, The Guardian reports.
The European Parliament argues the UK must accept EU citizens regardless of whether they enter the country before or after the triggering of Article 50.
This is because the UK will remain a member state with the same rights and obligations as other countries in the union for at least the next two years.
The Government has expressed concerns that the country would face a rush of EU citizens in the lead up to its exit from the European Union.
The Guardian also reports that the European Parliament has stated that the UK will not be able to negotiate a trade deal until after it has left the EU.
The European Parliament has the right to veto any Brexit deal at the end of negotiations in 2019.