Factbox - Britain's Brexit vote: How many lawmakers are backing PM 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 la