Boris Johnson could face a vote of no confidence this week as he braces for a test of his leadership.

A minister admitted the Conservative Party “may well” hold a vote on whether the Prime Minister should remain as leader, but backed him to “face down” the rebels calling for him to quit.

Almost 30 Tory MPs have publicly urged the Prime Minister to resign amid the fallout from revelations about Downing Street parties held during lockdown.

But reports have suggested more MPs privately want him to go and that enough letters demanding a confidence vote have been submitted to trigger such a showdown.

Under Conservative Party rules, if 54 letters from MPs are sent to Sir Graham Brady – the chairman of the 1922 Committee of backbench Tories – asking for a leadership poll then a vote is called.

St Helens Star: Sir Graham Brady (PA)Sir Graham Brady (PA)

As well as facing trouble on his backbenches, Mr Johnson also faced public backlash during the Platinum Jubilee bank holiday weekend, including being booed on Friday by some sections of a crowd during his arrival at a thanksgiving service for the Queen at St Paul’s Cathedral.

Tory fears about their leader’s standing among the public were also likely to have been further fuelled by polling carried out ahead of the Wakefield by-election by JL Partners.

The survey found the Conservatives could lose the key battleground seat by as much as 20 points to Sir Keir Starmer’s party this month.

With the Tiverton and Honiton by-election due to be held on the same day, June 23, as Wakefield, Mr Johnson faces the prospect of losing seats to Labour in the north of England and the Liberal Democrats in the South West.

The by-elections will be the first electoral test for the governing party since senior civil servant Sue Gray’s investigation into coronavirus rule-breaching events in No 10 and Whitehall was published last month.

St Helens Star: Paul Scully (PA)Paul Scully (PA)

Business Minister Paul Scully told The Andrew Neil Show: “We may well have a vote of confidence.

“If it does happen, the Prime Minister, I know, will face it down.”

Mr Scully said that, no matter the outcome of a potential vote, the party needed to move on to deal with the “big things” facing the country, admitting that the so-called partygate affair had “stretched out” for too long.

Reports have suggested that Sir Graham could announce a leadership vote as soon as Monday, with the secret ballot then said to be pencilled in for Wednesday.