In the United Kingdom House of Commons, an amendment to last Wednesday's Queen's Speech expressing regret that it did not contain legislation for a referendum on EU membership is defeated 277–131.
The United Kingdom says that it has requested to respond to a European Union notification of intent to start legal proceedings over the UK's alleged breaching of the Northern Ireland Protocol by mid-May. The UK says that its unilateral delay of the introduction of new Irish Sea border checks on food, parcels and pets is lawful.
At a European Union leaders' meeting in Salzburg, European Council President Donald Tusk says that he will push for an additional gathering in mid-November, allowing the United Kingdom's proposals to be "reworked and further negotiated".
Twenty-three European Union countries sign a defence integration pact known as the Permanent Structured Cooperation. NATO members Denmark, Portugal and the United Kingdom (withdrawal from EU underway), and non-NATO members Malta and Ireland, opt out.
Theresa May, the Prime Minister of the United Kingdom, announces March 2017 as the deadline for triggering Article 50 and says that her government will introduce a "Great Repeal Bill" that will repeal the European Communities Act 1972 once the United Kingdom leaves the European Union.
The United Kingdom's Prime Minister David Cameron announces he will suspend collective responsibility ahead of the referendum on the country's EU membership, allowing ministers to campaign for the UK to leave the European Union. A member of his cabinet was reportedly due to resign over the issue within 24 hours.