'Theresa May's EU withdrawal deal has been rejected by MPs by an overwhelming majority for a second time, with just 17 days to go to Brexit.
MPs voted down the prime minister's deal by 149 - a smaller margin than when they rejected it in January.
Mrs May said MPs will now get a vote on whether the UK should leave the EU without a deal and, if that fails, on whether Brexit should be delayed.
She said Tory MPs will get a free vote on a no-deal Brexit.
That means they can vote with their conscience rather than following the orders of party managers - an unusual move for a vote on a major policy, with Labour saying it showed she had "given up any pretence of leading the country".
The PM had made a last minute plea to MPs to back her deal after she had secured legal assurances on the Irish backstop from the EU.
But although she managed to convince about 40 Tory MPs to change their mind, it was not nearly enough to overturn the historic defeat she suffered in January, throwing her Brexit strategy into fresh disarray.
Setting out the next steps, she said that if the Commons declines to approve a no-deal Brexit in a vote on Wednesday, a vote on extending Article 50, the legal mechanism taking the UK out of the EU on 29 March, will take place on Thursday.
Announcing the free vote on a no-deal Brexit, she told MPs: "This is an issue of grave importance for the future of our country.
"Just like the referendum there are strongly held and equally legitimate views on both sides.
"For that reason, I can confirm that this will be a free vote on this side of the House."
Read more: Brexit: MPs reject Theresa May's deal for a second time
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