Nigel Farage said the United Kingdom should "have one last stab" and attempted to negotiate a Canada-style trade deal with the EU.
Speaking on his LBC show, he said: "If that doesn't happen we will walk away and they will probably get much more badly hurt by this than we will".
Brexit Secretary Dominic Raab said securing a deal was still "the most likely outcome" - but added making alternative arrangements was the "responsible" thing to do.
"The vote was a political debate".
Total cède 30% à Petronas — Rufisque offshore
Total se retrouve désormais avec une participation de 60% dans le bloc en question, le Sénégal contrôlant les 10% restants. Selon Les Échos, Total a cédé 30% de ses parts de Rufisque Offshore profond à la société pétrolière malaisienne Petronas .
"And that's because of the way the politicians have behaved".
Mr Farage's return is another potential headache for Mrs May, who is already facing bitter opposition to her Chequers proposals from a...
The former Ukip leader will tour the United Kingdom with the Leave Means Leave group to challenge the Prime Minister's Chequers "betrayal".
Writing in the British Daily Telegraph, he said he had made a decision to act as it had become clear the "political class in Westminster" was determined to frustrate the 2016 referendum vote to leave the European Union.
Kane scores as Spurs tops Fulham
Arsenal continue their hard start to the 2018/2019 Premier League campaign, with a trip to London rivals Chelsea this Saturday. Moura opened the scoring for Spurs just before half-time but they were pegged back when Aleksandar Mitrovic headed home.
The former UKIP leader wrote: "Theresa the Appeaser has produced a set of ideas that are nothing more than a cowardly sell-out".
Mr Farage wrote: "Over the last few months, and particularly since the Chequers betrayal, scores of people have stopped me in the street to ask: 'When are you coming back?' With all this in mind, now is the time for action", he said.
"The time has come to teach them a lesson - one that they will never forget".
He added: "Well now you have your answer: I'm back".
Mbappé n'a "pas le temps de rester à glander" — Paris SG
On devait montrer autre chose après notre première période . "Je n'ai jamais eu aucun problème avec mes équipes avant". Un but qui a récompensé des Guingampais entreprenants et qui ont même cru doubler la mise quelques minutes plus tard.