PM Theresa May doesn't have backing for her deal - so Parliament will see if a majority exists for any alternative.
British PM holds crisis talks with senior colleagues and hardline Brexiteers.
If the PM is toppled, Britain's exit from the European Union would be thrust into doubt.
UK Parliament divided on how, when or whether to leave, while EU fears Brexit delay can weigh on EU elections.
Deal rejected by the House of Commons after 242 MPs voted against it
'Stronger Towns Fund' seen as part of an effort to win Labour MPs' support for Brexit deal.
'Hold your nerve,' the British PM tells lawmakers as EU holds firm it will not reopen the deal.
But the EU, and particularly Irish PM Leo Varadkar, say they will not re-open the Withdrawal Agreement.
Report states that a deal with Ireland would remove opposition to her Brexit plan from the DUP.
Both leaders dig in their heels for competing visions.
MPs voted 325 to 306 that they had confidence in May’s government.
A survey of 1,215 party members found 59 pct opposed the deal, with only 38 pct in favour.
Theresa May could be toppled if 158 of her 315 lawmakers vote against her in the Wednesday ballot.
Junior Brexit minister says vote to proceed, after it was reported that May would buy time to ask for better terms.