European Union (Withdrawal Agreement) Act 2020 in the context of "Parliamentary sovereignty in the United Kingdom"

The European Union (Withdrawal Agreement) Act 2020 (c. 1) is an act of the Parliament of the United Kingdom that makes legal provision for ratifying the Brexit withdrawal agreement and incorporating it into the domestic law of the United Kingdom. It is the most significant constitutional piece of legislation to be passed by Parliament of the Second Johnson ministry. The Withdrawal Agreement was the result of Brexit negotiations.

On 24 July 2018 the Government produced a white paper on the proposed bill and how the legislation would work. The bill was first introduced by the government in the second session of the 57th Parliament on 21 October 2019 with the long title "A Bill to Implement, and make other provision in connection with, the agreement between the United Kingdom and the EU under Article 50(2) of the Treaty on European Union which sets out the arrangements for the United Kingdom’s withdrawal from the EU". This bill was not further debated after the second reading in the Commons on 22 October 2019 and lapsed on 6 November when parliament was dissolved in preparation for the 2019 general election.