By Kim Hjelmgaard, USA Today–

British Prime Minister Theresa May will try to win the support of her bitterly divided Cabinet on Wednesday for a draft deal to leave the European Union after months of stalled talks, false starts, political bickering and setbacks that have threatened the messy divorce known as Brexit as well as May’s leadership.

Britain is due to leave the bloc in March. On Tuesday, it broke a four-month-long logjam with EU negotiators over the terms of its withdrawal, including a plan to keep the border between the Republic of Ireland and Northern Ireland open after Brexit.

But pro-Brexit lawmakers in May’s divided Conservative Party are angry, saying the agreement will leave Britain tethered to the EU after it departs the bloc. Failure to secure Cabinet backing will leave May’s leadership in doubt and the Brexit process in chaos.

“It would probably mean a different government, incidentally, and it would mean taking the next year over having another referendum that might not resolve matters but Brexit might never happen at all,” former Foreign Secretary William Hague said in a BBC radio interview. Hague added that a new vote would be “the most divisive and bitter political conflict in this country in 100 years, and very economically damaging.”

If Cabinet supports the deal Wednesday, it needs approval from the EU at a summit in the next few weeks. Then May will need to win backing from Parliament, where pro-Brexit and pro-EU legislators alike are threatening to oppose it.

More: How much is Brexit costing Brits? A lot — and the tab keeps rising

This article originally appeared on USA TODAY: Brexit: Britain’s messy EU divorce faces new showdown