British Prime Minister Boris Johnson said the day ``marks a new beginning in our country's history and a new relationship with the EU as their biggest ally.''

If passed into law, the Internal Market Bill would undermine the EU's previously agreed oversight of trade to and from Northern Ireland.

The aim is to deny a majority to Prime Minister Boris Johnson who plans to take Britain out of the EU if he wins the vote on Dec. 12.

All parties worry that they could be hurt by voters' Brexit fatigue.

Analysts say the election is unpredictable because Brexit cuts across traditional party loyalties.

Have you forgotten how Brexit came to be? Here's a cheat sheet for the U.K.'s high-profile divorce.