Boris Johnson and Jeremy Hunt are going head-to-head in their only televised debate of the Tory leadership contest.
The two candidates to succeed Theresa May clashed after a day in which tensions between the UK and the US deepened following the leak of comments made by the British ambassador in Washington.
Earlier, MPs overwhelmingly backed moves to extend abortion and same-sex marriage to Northern Ireland, if power-sharing is not restored by October.
Meanwhile, Jeremy Corbyn told party members that Labour will back Remain in a new referendum over a no-deal Brexit or a Conservative agreement.
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Jeremy Hunt says Boris Johnson will consign UK to 'do or die' no-deal Brexit just so he become PM
Jeremy Hunt says Boris Johnson will consign UK to 'do or die' no-deal Brexit just so he can become PM
Fiery TV clash sees contenders to succeed Theresa May trade blows
Analysis: Boris Johnson is a gremlin - he will dissolve on contact with the truth, writes our political sketch writer, Tom Peck
Opinion: Boris Johnson is a Gremlin. He will dissolve on contact with the truth
After an hour in the glare of the studio it's clear yet again that he hasn't got a clue what to do about Brexit, but the Tory party is long past caring
Matt Hancock, who is backing Boris Johnson, has a dig at Jeremy Hunt's accusation that Johnson is "peddling optimism"...
Boris Johnson refuses to promise to keep Kim Darroch as US ambassador
Boris Johnson refuses to promise to keep Kim Darroch as US ambassador
Boris Johnson has refused to say he would keep Sir Kim Darroch as Britain’s ambassador to the US if he became prime minister.Jeremy Hunt and Boris Johnson clash: "You haven't answered any of my questions", says Hunt
Snap analysis: The debate was more heated than many people expected it to be, with both candidates landing several punches.
Jeremy Hunt landed the most blows and pushed his rival well on several areas, including whether he would resign if he failed to deliver Brexit by 31 October, and whether he would rule out proroguing parliament. Johnson seemed evasive throughout, and Hunt leapt on it.
The current frontrunner also became increasingly rattled, frequently shouting over his rival and the moderator, Julie Etchingham.
Hunt, calm and assured, appeared the most statesmanlike, and had some good lines on Mr Johnson's trustworthiness and the detail of his promises. He accused him of a lack of leadership and prioritising tax cuts for wealthy people, and suggested that Johnson was making empty promises and failing to provide enough detail. It was a clear strategy to suggest that his rival is unfit to be prime minister.
But Johnson had some good barbs of his own, quickly turning Hunt's points about realism into accusations of negativity. He was also quick to point out that his rival was not a "true" Brexiteer, and accuse him of opportunism.
Johnson's responses will go down well with the people who matter in this contest: Tory members. He accused his rival of "defeatism" and "managerialism" and offered a much more upbeat message, particularly on Brexit. That is what the party faithful want to hear.
While Hunt offered realism and seriousness, the accusation that he is overly negative could prove effective. Many people may not fully buy into Johnson's promises but voters are known to love a positive message.
The debate is unlikely to change the outcome of the contest, and the surprising level of bitterness between the two candidates could prove the most significant takeaway. If Boris Johnson does become prime minister, will Mr Hunt's aggression tonight cost him his cabinet job? We'll find out in a few weeks' times.
We're onto the last question, which is about the qualities the candidates admire in each other.
Boris Johnson struggles to answer. He eventually says: "I greatly admire his ability to change his mind and campaign for Brexit now."
Hunt gives an equally petty answer, sarcastically saying he admires Johnson"s ability to answer a question.
It's been a much feistier debate than many expected, and ends on a bitter note, as Johnson says the country has had enough of the "managerialism" that Hunt embodies.
The pair make their usual closing statements, with both saying they are the most likely to deliver Brexit, and that is it. Analysis to follow.
The candidates are asked about scrapping the ban on abortion in Northern Ireland. Hunt says yes, but Johnson says it should be a matter for the people of Northern Ireland.
Jeremy Hunt attacks Boris Johnson over his promise to cut taxes for higher earners, saying it sends "the wrong message about our party"
Johnson says he would prioritise tax cuts for lower-paid people. He asks Hunt if he supports people on "moderate, middle incomes" paying the higher rate of tax.
Hunt says his priority is people on low incomes. He says:
"I have spent my life trying to persuade people that we are not the party of the rich, we are party of everyone."
Boris Johnson: "We've had a bellyful of defeatism"
The candidates are now rowing over the future of Sir Kim Darroch, the UK ambassador to the US.
Hunt promises to keep Sir Kim in post "until he is due to retire" and challenges Johnson to say the same. Johnson says he would not be "presumptuous" enough to assume he will be in a position to take that decision.
The first question after the interval sees the candidates asked why their personal qualities mean they should be prime minister.
Boris Johnson says he can unite the Tories and the country, pointing out that he won two elections as London mayor and helped Leave to win in the 2016 referendum.
Jeremy Hunt says he is prepared to do the unpopular and stand up to people, as he did to Donald Trump today. He gets a big round of applause for saying the US president's comments were "unacceptable".
Johnson is asked whether he agrees that the comments were wrong. He refuses to do so, going off on a tangent about the importance of the UK-US relationship, before sort of admitting that Trump should not have said what he did.
Here's the clip of that first attack by Hunt on Johnson:
The candidates are asked if they would be willing to prorogue parliament to force through a no-deal Brexit.
Hunt say no, because the last time it happened there was a civil war.
Johnson refuses to rule it out, saying it would be astonishing to do so because it would further weaken the UK's negotiating position.
Jeremy Hunt tells his rival:
"Being prime minister is about telling people what they need to hear, not just what they want to hear. The difference between you and me is that you are peddling optimism."
Boris Johnson responds:
"I think this country needs a bit of optimism, frankly."
Hunt attacks Johnson for claiming that WTO rules mean the UK would not have tariffs if it left the EU without a deal, saying this is is "totally unrealistic".
He says:
"Getting details like that wrong is fine for a newspaper column but if you're prime minister that is people's jobs at stake."
Johnson is getting angry. He responds by calling Hunt "defeatist" and "someone on the other side of the argument for so long".
Hunt has a good response, telling Johnson: "We will not leave the EU just with optimism".
Boris Johnson says fears of no deal have been "escalated in public discourse".
Hunt disagrees, saying the impact of no-deal on businesses would be "very serious" but that he has a ten-point plan for helping the UK cope.
Johnson says only a "badly-handed" no-deal Brexit would be costly and that it would be "vanishingly inexpensive" with the right preparation.
Hunt asks Johnson if he would resign if he does not deliver Brexit by 31 October. He refuses to answer.
Laying into Hunt, he says another delay means "forfeiting trust with the electorate and undermining our negotiating position in Brussels".
Johnson says he does not want the EU to know whether he would be prepared to resign, as this would strengthen their hand.
Hunt goes in hard, saying Johnson is willing to put the country's neck on the line but not his own. "That is not leadership," he says.
The first question comes from someone who says he wants to see Nigel Farage as prime minister. He asks whether the candidates can guarantee Brexit by 31 October.
Hunt says no one should promise something they cannot deliver. He says the only way to guarantee Brexit by that date is to secure a new deal with Brussels, and that he is the person to do that.
Johnson says leaving by 31 October is crucial to avoiding "haemorrhaging" trust in politics. He says he would make the EU understand that he is prepared to leave with no deal and would deliver Brexit by 31 October whatever happens.
