Theresa May faces a grilling from MPs later over the draft Brexit agreement the UK has reached with the EU.
The PM secured her cabinet's backing for the deal after a five-hour meeting, although several ministers are understood to have spoken against it, according to BBC report.
She has also faced a backlash from Tory Brexiteers and her Democratic Unionist Party (DUP) backers, amid suggestions of moves to force a no-confidence vote.
Labour will announce later whether or not it will back the deal.
However, leader Jeremy Corbyn said he did not believe the agreement - set out in a 585-page document - was in the national interest.
Mrs May is due to give a statement to the House of Commons on Thursday morning.
She emerged from the marathon cabinet meeting on Wednesday evening and declared the choice before the UK to be clear.
"This deal, which delivers on the vote of the referendum, which brings back control of our money, laws and borders, ends free movement, protects jobs, security and our Union; or leave with no deal, or no Brexit at all."