British Prime Minister Theresa May is facing likely defeat in parliament on Tuesday when she asks lawmakers 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. She has promised to respond quickly to any defeat.

So what could happen next if she loses? Watch the video to find out.