MPs are preparing to vote on whether to back Theresa May's deal for leaving the European Union, the BBC reports.
The so-called "meaningful vote" will take place later as five days of debate on Brexit comes to an end.
Mrs May has called for politicians to back her deal or risk "letting the British people down".
But with many of her own MPs expected to join opposition parties to vote against the deal, it is widely expected to be defeated.
MPs will also be able to suggest amendments that could reshape the dealbefore voting starts at around 19:00 GMT.