Britain's huge Brexit Saturday

Brexit, or Britain’s withdrawal from the European Union, faces a huge test on Saturday.

On Saturday, parliamentarians will vote on Prime Minister Boris Johnson’s new withdrawal agreement with the EU. Agreed with the EU on Thursday, that deal is mostly the same as the one former Prime Minister Theresa May negotiated but failed to shepherd through Parliament. The major difference is that Johnson’s new deal removes concerns over an “Irish backstop” involving customs controls taking effect if a long term U.K.-EU trade deal isn’t reached.