Zeinab Badawi speaks to Michel Barnier, former EU chief Brexit negotiator. How does he see the fallout from Brexit and why does he think he is fit to be the next president of France?
The protocol was negotiated less than two years ago, the EU's former chief Brexit negotiator says.
By John Campbell
BBC News NI Economics & Business Editor
By Nick Beake
Boris Johnson said the UK has "taken back control", while Ursula von der Leyen said it was time to "look to the future".
The EU and UK have reached a post-Brexit trade deal, ending months of disagreements over the future relationship.
By Chris Morris
Reality Check correspondent, BBC News
EU Chief Brexit negotiator Michel Barnier says the UK and EU have "very little time remaining" for an agreement.