The Brussels boss raised eyebrows with a series of eye-catching initiatives and an openly federalist agenda, jettisoning much of the caution seen in previous years.
Mr Juncker spoke at length about trade, the eurozone, migration, defence and foreign policy and the single market, on each occasion advocating more Europe as the answer.
The speech was described as a “step-by-step move towards a European superstate” by one Tory MEP and Mr Juncker’s snipe, in which he said that he believes Britain will regret Brexit soon, certainly caught the attention of the fervent Brexiteer.
Mr Rees-Mogg, who has recently been tipped as a favourite to replace Mrs May, hit out at the Brussels boss for failing to grasp the reasons behind Britain’s decision to leave.
He said: “No one ever regrets liberty. Mr Juncker does not understand our desire to rule ourselves according to our own democracy and never will.”
Mr Rees-Mogg was not the only Brexiteer to hit out at Mr Juncker’s Brexit doom-mongering – former Ukip leader Nigel Farage hailed Britain’s decision to leave after sitting through the EU chief’s speech this morning.
He called Mr Juncker’s plans to expand the powers of the EU without a vote “extremely worrying” and shouted: “Thank God we’re leaving! You’ve learned nothing from Brexit!”
He added that Mr Juncker and his colleagues were appointing powerful unelected people in positions of huge power, including “a finance minister who intervenes when he feels it necessary” and plans for “a European army with a more aggressive foreign policy.”
“And all this to be done without the consent of the people.”
Mr Farage was clearly appalled by Junker’s earlier claim that the EU could appoint pan-European ministers with unprecedented powers WITHOUT any form of electoral process.
Mr Juncker said: “A European Monetary Fund needs to be anchored in the European Union. We need a European minister of economy and finance, a minister to promote structural reform in our member states.
“These euro-wide policies in the EU don’t need treaty change as long as it is decided in the European Council.”
Mr Farage said: “Mr Juncker, that was the most open, honest and most worrying speech I ever heard. What you’re saying is: Brexit has happened, full steam ahead!
“Attacking European proposals to introduce a bizarrely complex pan-European voting system Mr Farage said: “Genuine democratic parties of oppostions won’t be able to compete on a level…