The 27 members of the EU agree on guidelines for a new treaty after negotiations to replace EU's current constitution.
- The European Court of Justice dismisses complaints by Slovakia and Hungary about EU migration policy, upholding Brussels' right to force member states to take in asylum seekers.
- The European Union's executive branch sends a formal notice to Poland expressing their concern that the new "discretionary" powers given to the country's justice minister threaten the independence of the courts in violation of EU laws. Poland has a month to respond.
- Poles march against a bill that critics say might decrease judicial independence in Poland. Hungary has supported the bill while the European Union has opposed it. The protesters hope that the President Andrzej Duda would intervene against the proposed law.
- Bank of America chooses Dublin as its European hub.
- The European Union restricts the exports of inflatable boats to Libya.
- France's National Front leader Marine Le Pen is under investigation for alleged misuse of European Union funding.
- UK Prime Minister Theresa May announces that citizens of the European Union living in the United Kingdom will be able to acquire a "UK settled status" after the UK leaves the EU.
- A European Union law enters force, scrapping roaming charges for people using mobile phones abroad within the EU and the European Economic Area.
- The European Union's visa-free regime for Ukraine officially enters into force.
- Conservative politician Theresa May accuses European Union officials of trying to influence the upcoming elections.