Anti Brexit protester debates with Leave protester in Westminster on the day that Parliament reconvenes after summer recess to debate and vote on a bill to prevent the UK leaving the EU without a deal at the end of October, on 3rd September 2019 in London, England, United Kingdom. Today Prime Minister Boris Johnson will face a showdown after he threatened rebel Conservative MPs who vote against him with deselection, and vowed to aim for a snap general election if MPs succeed in a bid to take control of parliamentary proceedings to allow them to discuss legislation to block a no-deal Brexit.