LyrArc Article Gist
As the British parliament prepares to vote on Brexit deal put forward by prime minister Theresa May, Joanna Sugden summarizes what is expected as the next step if parliament rejects it. 

Why are a faction Conservative members opposed to it?

There is the Irish backstop which they oppose. Keeping open the border between the two Irelands- Northern Ireland as part of Britain and Ireland as a EU country is important to preserve peace achieved through the Good Friday Agreement between the Catholic and Protestant communities.May wants to keep the border open. Far right Conservatives see this as keeping Britain connected to the EU in some way which they oppose. They stubbornly hold onto this view.

Add to this the opposition from the Remain campaign which sees leaving the EU as bad for Britain's economic future. Some Leave supporters now see the dangers of Brexit, especially leaving with no deal made with the EU. Most of the Labour Party members fall into this group.

What happens if parliament rejects May's deal by a small margin?

The deal would be renegotiated with the EU to tweak it for more support.

What happens if parliament rejects it with a huge margin?

This would result in several options. May could call a general election. Britain could have a second referendum on Brexit. Or in a chaotic situation Britain could leave the European Union without a deal altogether, something everyone wants to avoid because of the disruptions it would cause. May is using this risk as  a way to persuade reluctant MP's but it may not work.