Commission Vice-President Maros Sefcovic convened the meeting to find out more about the UK's plans regarding its Internal Market bill that may be in conflict with the withdrawal agreement.
Earlier this week, the UK unveiled the Internal Market Deal, setting up how trade powers that are currently held by the EU will be shared out starting from 1 January 2021 after the Brexit transition period expires.
The deal has met much criticism for possibly violating international law.