UK Triggers Article 50 — Brexit Formally Begins

Prime Minister Theresa May delivered the Article 50 notification letter to European Council President Donald Tusk, formally beginning the two-year clock for negotiating the UK's withdrawal from the EU. The EU negotiating team was led by Michel Barnier. Three years of tortured negotiations followed, featuring two rejected Withdrawal Agreements, multiple parliamentary defeats, a general election, and three extensions of the Article 50 deadline.