Labour's deputy leader Angela Rayner has said the party is considering "all options" following Boris Johnson's bruising no-confidence vote.
The prime minister narrowly won an attempt by Tory rebels to oust him from office, having spent months under political pressure over the Partygate scandal.
Despite claiming a "convincing" and "decisive" victory, Johnson is having to contend with the fact 148 of his own MPs - 41% - voted against him, meaning he is not out of the woods just yet.
In last night's vote, only Tory MPs were allowed a say on whether to keep Johnson as leader.
Watch: Boris Johnson rules out prospect of snap election after winning confidence vote
Asked if Labour would table their own vote of no confidence in the PM, Rayner said her party would “consider all options”.
She told BBC One’s Breakfast show: “We will consider all options but, to be honest, I think the Prime Minister is just once again making it very difficult to deal with the issues that people face today.
The Lib Dems have already said they will try and force such a vote in the House of Commons so all MPs can have their say on Johnson's premiership.
Rayner added: “The British people deserve the best from our politicians not worst, so the bar should be set at a reasonable level which says if you lie to the British public, if you get a fixed-penalty notice because you broke the law whilst in office by your own rules, then you shouldn’t be Prime Minister of this country."
Rayner also branded Johnson as “arrogant, dismissive, a liar” and is “mortally wounded after surviving a confidence vote."
She added: “I don’t think it is a good thing he continues, I think he is arrogant, I think he is dismissive, I think he is a liar and I don’t think he should hold the office of Prime Minister.”
Liberal Democrat leader Sir Ed Davey has said the party will put forward a vote of no confidence in Johnson.
Davey told Sky News: "If it can be debated, I hope a lot of those 148 MPs who don’t have confidence in the prime minister will vote with the Liberal Democrats and other opposition parties so we can remove this prime minister."
Monday night's vote saw a result which was worse than Theresa May's vote of no confidence in 2019, which ultimately led to her leaving the job just months later.
But senior Tories have closed ranks on Johnson, insisting it was a "clear" victory.
Deputy prime minister Dominic Raab told Sky News: “The Prime Minister won it with 59% – that’s actually more than he got in terms of support when he was elected leader of the Conservative Party.
“We’ve had that vote now, it was the prerogative of those calling for it to have it.
“The Prime Minister won it clearly, he won it by 63 votes, and now the most important thing is to respect that vote and move forward.”
Others, however, have given a different view.
Will Walden, former press secretary to Boris Johnson, said the result was disastrous for the PM, despite it meaning he can continue in his position - for now.
"The truth is, and they know it and Boris knows it, this is the worst possible result short of losing," he said.
"The prime minister needed a decisive win last night and he didn't get it. He's told us it's convincing and it's decisive, it isn't that unfortunately with 70-75% of his backbenchers voting against him and he wants to move on.
"The problem is that it's very unlikely that he's going to be allowed to move on."