The Brexit negotiations are in a "mess" and a delay to Britain's withdrawal from the EU is almost "inevitable", Tony Blair says.
The former prime minister said MPs were right to reject Theresa May's deal in the Commons on Tuesday and that a second referendum now offered the best way forward for the country.
"This is a complete mess now, given everything that has happened, given the state of our knowledge now, it is not unreasonable to ask people if they want to think again," he told BBC Radio 4's Today program.
Blair criticised Jeremy Corbyn for refusing to meet the May and said the Labour leader needed to make clear where his party now stood.
"If, in a moment of national crisis, the prime minister asks the Leader of the Opposition to come and talk, of course he should," he said.
"It is quite hard to read the runes sometimes in Labour policy right now, but as I understand our position is that if the no confidence motion fails, as it has, then there is an overwhelming majority for supporting putting this back to the people."
With parliament apparently deadlocked over the way forward, Blair said he believed the government would have to seek an extension to the Article 50 withdrawal process.
"I think that is inevitable now virtually whatever you do. If I was the government now, I would already be having discussions with Europe about the terms of an extension," he said.
He dismissed claims that May needed to maintain the option of a no-deal Brexit in order to retain leverage in the negotiations with Brussels, saying it was not a credible threat.
"If you do no-deal you are going to do major damage to the British economy," he said.
"If you are threatening the person sitting across the table from you that you are going to jump out of the window if they don't do what you say, they probably don't want you to jump out of the window, it is going to do them harm, but it is going to do us a lot more harm."
Blair said parliament was now facing a choice between a "hard" Brexit, which would be economically "painful", or a "soft" Brexit, which would be "pointless" as the UK would still be tied to EU rules without any say over them.
"At some point you are going to have to decide do you want a Norway-type solution, which is your soft Brexit, which leads to the charge that it is pointless, or do you want your Canada-style free trade agreement, in which case that's going to be painful," he said.
"What she (May) has got to do now is take a step back, run the options through parliament and parliament has got to come to a decision.
"It can either do a soft Brexit, which is Norway, it can do a hard Brexit, which is Canada, or, frankly, it can go back to the people, which I think is the most sensible."
Australian Associated Press