The Liberal Democrats, who back a second referendum on Brexit terms before a deal is struck, held their party conference in Bournemouth where Mr Cable made his keynote speech yesterday.
Speaking to Politico the new Lib Dem leader said Juncker’s State of the Union address, where he outlined plans to create a federal EU, had been a boost to the narrative of “extreme Brexiteers”.
Mr Cable said: “The lack of understanding on the European side is actually making it worse.
“That Juncker speech was dreadful. I know that he has a European audience, but Remainers in the UK are in despair when they hear that kind of stuff because it directly feeds the narrative of the extreme Brexiteers, who will say: ‘If we stay in, we lose our sovereignty, we are part of a federal European superstate.’”
The Europhile also claimed Brussels had an opportunity to avoid Brexit but blew it when they refused to concede on David Cameron’s demands for freedom of movement.
The Lib Dem leader accused the EU of a “lack of flexibility” over the issue of migration which he pinpointed as the main reason the UK voted Leave.
The Twickenham MP said: “There are all kinds of de facto rather than de jure limitations on freedom of movement. Pragmatism on all sides would have helped avoid this crash. And it is going to be an awful car crash.”
Mr Cable called on the EU’s Brexit team not to make the same mistakes as talks continue to stall.
He went on to warn that the UK would find it even harder to get out of the European Union if Mrs May was replaced by high-profile a Brexiteer such as Foreign Secretary Boris Johnson.
The Pro-EU MP even appeared to sympathise with his rivals position saying she was a “hostage” to Brexiteers.
He said: “Theresa May is trying to bridge the Brexiteer-Remainer gap. She’s not doing a very good job of it. She’s rather a hostage of the Brexiteers.
“But if you have got David Davis, and even more some of the others, the confrontation with the European Union would be much starker.”
The former business secretary added that the Liberal Democrats would have stopped Brexit if they had continued in Government after the coalition ended as the party countered the anti-EU Tory right.
Mr Cable also claimed Remainers David Cameron and George Osborne were relying on a…