The United Kingdom is scheduled to leave the European Union on March 29, 2019. UK Prime Minister Theresa May has been scrambling to draft and pass a withdrawal agreement that would prevent a costly and diplomatically destructive exit from the EU without a deal. At the conclusion of a five-day debate, the British legislative House of Commons rejected May’s deal and increased the likelihood of a “no-deal” Brexit. Here are the key dates and players that have led up to the January 15 vote by the members of Parliament.