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Momentum has launched a bid to make Boris Johnson the first sitting Prime Minister to lose his seat.

The former Foreign Secretary’s Uxbridge and South Ruislip seat is precarious, with his majority having halved at the last election.

And now the Jeremy Corbyn-supporting campaign group has launched a mass canvassing and social media campaign to unseat him altogether.

Johnson has a majority of just 5,034 - and if selected as Prime Minister would have the smallest personal majority of any candidate since Ramsay MacDonald in 1924.

(Image: REUTERS)

The group will launch a mass door-knocking campaign on Sunday July 21, the weekend before the new Tory leader is announced.

Becky Boumelha, a member of Momentum’s National Coordinating Group, said: “From calling women who wear burqas letterboxes to endangering British nationals abroad and plotting to beat up journalists, it’s clear Boris Johnson isn’t fit to hold any form of public office, let alone become prime minister.

“At the Peterborough by-election last month Labour unexpectedly beat the Brexit party after Momentum mobilised more than 1,000 activists to knock on doors and make phone calls.

“Now we’re launching a campaign to make sure Johnson goes down in history as the first sitting prime minister to lose his seat. At the last election we slashed his majority in half, and now even Tories admit his seat is vulnerable to a surge in young voters at the next election.

(Image: PA)

Ali Milani, Labour’s candidate in Uxbridge and South Ruislip, said: “Ever since Boris Johnson was parachuted into Uxbridge and South Ruislip, he’s neglected his constituents and concerned himself only with his own career.

"Bragging about “sticking up for bankers” in his bid to become Tory leader might go down well with party members, but the people of Uxbridge and South Ruislip are less than impressed.

“Our community deserves better, and as a local resident, community activist and prospective Labour MP I’m proud to be taking part in a campaign to unseat a potential sitting prime minister.”