Sir Graham Brady MP says: "The threshold of 15% of the parliamentary party seeking a vote of confidence in the leader of the Conservative Party has been exceeded.

"In accordance with the rules, a ballot will be held between 18:00 and 20:00 today MONDAY 6th JUNE - details to be confirmed.

"The votes will be counted immediately afterwards. An announcement will be made at a time to be advised. Arrangements for the anno will be released later today."

This is a secret ballot - to win, Johnson would need to secure a simple majority.

Currently, this means he would have to gain 180 votes (half his MPs, plus one) - assuming every Conservative MP casts a vote and nobody abstains.

If Johnson lost, there would be a leadership contest and he would be barred from standing.

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It’s expected that Sir Graham Brady will announce in the next few minutes that a vote of confidence in the prime minister will be held today, the BBC's political editor Chris Mason reports.

It's increasingly likely that Boris Johnson could face a possible vote of confidence in his leadership as MPs return to Westminster today after the half-term break.

Here’s a quick round-up of what’s been happening so far this morning:

• Tory MPs have told the BBC a no confidence vote could be triggered this week
• For a confidence vote to happen, 54 Tory MPs must write a letter to Sir Graham Brady, the chairman of the backbench 1922 Committee
• Sir Roger Gale, Conservative MP for North Thanet, told the BBC the Conservative Party is “spoilt for choice” when it comes to options for a new leader
• Jesse Norman, the MP for Hereford and South Herefordshire, became the latest Tory MP to announce that he has put in a letter to Brady
• But ministers backed Johnson on Monday morning, with Health Secretary Sajid Javid telling the BBC that while he believes a vote of confidence is “likely”, it is “not something the country needs”

Health Secretary Sajid Javid said he thinks it is "likely" there will now be a confidence vote.

Speaking to BBC Breakfast, Javid said: "My understanding probably isn't much more than yours because you'll probably know, or many of your viewers will know, that to have what's called the vote of confidence requires at least 54 of my colleagues to write into Sir Graham Brady, to ask for one.

"Now, will that happen? I don't know. That's that's a decision for my colleagues. I think it's likely that something like that will happen.

"But it's not something that I could tell you definitively.

"But it's not what I think actually the country needs," he added.

"I hope there isn't - you have to be prepared but I think that what the country wants is for the government to get on and focus on the job at hand, which we are."

Jesse Norman, who was previously loyal to Johnson, has become the latest Conservative MP to call for for a confidence vote in his leadership.

In a letter he has tweeted, he says to Johnson: "I am afraid I can see no circumstances in which I could serve in a government led by you."

Good morning and welcome to our live coverage, as a vote of confidence by Tory MPs on Boris Johnson's leadership looks increasingly likely.

Fifty-four Conservative MPs need to submit letters asking for the vote - and it looks like that tally might soon be reached. It comes as MPs return to Westminster on Monday after the half-term break.

We’ll be bringing you all the key political updates as we get them so stay with us on this page.