If Britain does leave the EU, Johnson believes that the chaos will be preferable to the terms offered by the union because, eventually, Britain will adapt.
"The referendum took place".
"We make sensible contingency plans for all kinds of eventualities, whether it's a terrorist attack, or whether it's a tanker drivers' dispute, or industrial action or whatever else it might be", Carter said. "There are many Conservative MPs who share Jo Johnson's serious concerns".
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"That's not a meaningful vote".
"They're questions about the benefits to every part of the UK".
The comments from Mr Ellwood came after Chief of the Defence Staff General Sir Nick Carter said the military was "thinking hard" about what such a scenario might entail.
But, in an unusual show of solidarity in the days of Brexit negotiations, both Labour and Tory MPs appeared on the Sunday politics shows to defend their leaders.
Prime Minister Theresa May this week faced pressure from her Westminster allies in the Democratic Unionist Party not to allow a customs border to split Northern Ireland from the United Kingdom after Brexit. "As with any fork in the road, there is always the option of turning back home".
In a video on Twitter, Johnson said the United Kingdom was "barrelling" towards an incoherent Brexit, leaving the nation "trapped" in an subordinate relationship to the European Union. British trade minister Liam Fox also issued a fresh warning that Britain may not agree a deal if a solution can not be found.
The resignation is not just significant for the government's immediate plans, but also is yet another vote in parliament that could reject the Brexit plan, leaving the whole project in a crisis without any clear resolution. A second referendum on the departure is anathema to the supporters of Brexit.
Labour, meanwhile, are sending out conflicting messages, with Jeremy Corbyn's critics getting excited about reports that he told a German newspaper that he can't stop Brexit.
In the June 2016 referendum, 17.4 million voters, or 51.9%, backed leaving the European Union while 16.1 million, or 48.1%, backed staying.
The British prime minister is set for a crunch meeting with her Cabinet early this week, where she will attempt to get her European Union withdrawal agreement signed off by senior ministers.
"Given that the reality of Brexit has turned out to be so far from what was once promised, the democratic thing to do is to give the public the final say", he added.