Since then, in an effort to win enough support from lawmakers across the political spectrum, May has sought "legal and political" assurances from EU leaders — most notably on the so-called 'backstop' arrangement for the Irish border.
So far, there has been little sign of any willingness from Brussels to offer May the legal cover she has been seeking.
Sterling has fallen more than 10 percent against the U.S. dollar since reaching a peak of $1.4335 in April 2018, in part due to rising fears over the course of the Brexit process. The U.K. currency was trading at around $1.2905 Tuesday morning.
Some of the most likely options include: May's vote securing parliamentary approval, no-deal Brexit, a major renegotiation to a new Brexit deal, calls for a general election, a vote of no confidence in the government or another referendum.