Theresa May wants to change the rights of those who arrive after the UK begins the transition of leaving the EU expected to be 29 March 2019. This would involve a new post-Brexit immigration scheme with different rights during the transition.
This however is at odds with how the EU see the transition period working. Guy Verhofstadt, the European Parliament’s Brexit co-ordinator, said
Guy Verhofstadt, the European Parliament’s Brexit co-ordinator, said the UK will have to remain subject to EU legislation and case law for the duration of the transition including immigration.
“We will not accept that there are two sets of rights for EU citizens. For the transition to work, it must mean a continuation of the existing acquis with no exceptions.”