Brexit vote: Here's how many British lawmakers are backing PM Theresa May

Britain's parliament is debating whether to support Prime Minister Theresa May's Brexit deal, a decision which will define Britain's departure from the European Union and set the course for the country's economy.

The odds look stacked against May winning parliamentary approval for her deal, which has come under fire from all sides, including eurosceptics, supporters of the EU and the Northern Irish party propping up her minority Conservative government.

Below is a running tally of the number of lawmakers who have indicated during the first four days of a five-day debate whether they will support the Brexit deal on January 15.

Lawmakers are entitled to change their mind before the vote, and some who speak are yet to make a final decision on the deal.

There are a total of 650 lawmakers in parliament. Of those, around 100 are government ministers and Conservative Party enforcers, or whips, who are required to support the deal and so are not included in the tally.

May's Conservative Party has 317 lawmakers. It governs with a working majority of 13 thanks to a deal with the 10 lawmakers of the Northern Irish Democratic Unionist Party.

Lawmakers who have indicated they will support the deal: 32

Lawmakers who have indicated they will oppose the deal: 93, including 27 of Theresa May's Conservative lawmakers.