Explainer - What happens if May loses vote on her Brexit deal?

British Prime Minister Theresa May is facing likely defeat in parliament on Tuesday when she asks members of Parliament (MPs) to approve her Brexit deal - a decision that would trigger huge uncertainty about the future of Britain's exit from the European Union.May has warned that rejecting her deal opens up the possibility of Brexit being stopped, or that Britain leaves disruptively without a deal.May must submit a new plan for Britain's next steps by the end of Jan. 21.