MPs will be asked to vote on the Prime Minister's Brexit deal this week, as the government begins its push to take Britain out of the European Union.
The Withdrawal Agreement Bill (WAB) will be brought before the Commons on Friday - and could be debated at first and second reading in one day, if Speaker Lindsay Hoyle agrees to the timetable.
During the election campaign, Boris Johnson pledged to start the process of exiting the EU before Christmas Day if re-elected.
The Prime Minister's official spokesman told a Westminster briefing: "We plan to start the process before Christmas and will do so in the proper constitutional way in discussion with the Speaker."
Asked if the legislation would be identical to that introduced in the last Parliament, Mr Johnson's spokesman said: "You will have to wait for it to be published but it will reflect the agreement that we made with the EU on our withdrawal."
The government is set to attempt to push the Brexit Bill through its final Commons stages in January, in the hope the Bill then clears the Lords quickly to allow the UK to leave the EU on January 31.
However, approving the legislation will not mean the Brexit is over. The UK will remain in the EU until at least the end of 2020 during the implementation period.
This time will be used to negotiate a trade deal, and decide on the future EU-UK relationship with regards to subjects such as security.
The Queen will formally open Parliament on Thursday when she sets out the government's legislative programme.
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