BORIS Johnson is hoping to retain his Uxbridge and South Ruislip seat in the 2019 Election.
But what happens if he is defeated while the Tories get a majority? Here's our lowdown...
Boris Johnson faces a fight to keep his own seat in Uxbridge and South Ruislip in the December electionCredit: AP:Associated Press
Boris Johnson has been MP for Uxbridge and South Ruislip in west London since 2015 when he returned to the Commons seven years after he left his safe Henley seat to become London Mayor.
When he first stood, he commanded a healthy majority of 10,695.
But in Theresa May's disastrous election of 2017, this had halved to 5,034.
A similar decline in his vote this time would see him lose his seat.
If Mr Johnson fails to get re-elected as an MP, constitutionally he could continue as PM if he appointed himself as a Lord.
But he would face overwhelming pressure to stand down, as the last Prime Minister to lead a government from the Lords was the Marquess of Salisbury who retired in 1902.
Uxbridge has elected Tory MPs since 1966 but its demographics are changing as more young people move into the area.
Meanwhile Mr Johnson's backtracking on his long-held opposition to a Heathrow third runway may also cost him votes.
The Prime Minister vowed to lie down "in front of bulldozers" to halt the runway when first elected as MP in 2015.
However when the crunch vote took place in the Commons he swanned off for a one-day trip to Afghanistan.
Research by the Tory think tank Onward this year suggested the seat was "vulnerable".
The constituency is not just Uxbridge itself, but stretches up north towards Conservative heartlands of Buckinghamshire, taking in RAF Northolt, and through poorer areas in the south to border shadow chancellor John McDonnell's seat of Hayes and Harlington.
The PM is standing against Labour's Ali Milani, a 25-year-old immigrant from Iran who grew up in an Uxbridge council house
Who is Boris Johnson standing against?
The PM is standing against Labour's Ali Milani, a 25-year-old immigrant from Iran who grew up in an Uxbridge council house and attended the town's Brunel University.
A bullish Mr Milani said: "I think we can beat him one on one, genuinely.
"People feel powerless – there's a small group of Tory members who will make him PM – and we're saying no you're not powerless, we can unseat him here, this is all the power in the world."
Momentum plans to aggressively target the seat in what it's called an "Unseat Boris" campaign.
It is set to target it with hundreds of volunteers knocking on doors and pumping money into a social media operation to target swing voters.