Jean-Claude Juncker has said he is 'convinced Brexit will happen' - as he insists there will be a hard border in Northern Ireland if the UK leaves the EU without a deal.
'I'm convinced that Brexit will happen,' he told Sky News in an interview last week, before he had seen the ideas Boris Johnson's government sent to Brussels to try to push Brexit talks forward.
The European Commission president has also made clear that Brussels will insist on checks between Northern Ireland and the Republic after a No Deal.
But Juncker claimed the EU would be 'in no way responsible' for the consequences, saying blame would lie squarely with the UK.
'We have to make sure that the interests of the European Union and of the internal market will be preserved', he said.
The intervention heaps on the pressure as the clock runs down on the latest Brexit deadline.
The two sides look deadlocked over Boris Johnson's demand that the hated backstop mechanism - a contingency plan to prevent a hard border by keeping the UK aligned with many of Brussels' rules - be scrapped.
The PM has vowed that the UK will leave on October 31 regardless of whether there is an agreement in place, and will not install any infrastructure at the border.
Meanwhile, Juncker told the Spanish newspaper El Pais today that there is still time for a deal to be done and described recent talks with Mr Johnson as 'constructive and partly positive'.
Speaking to Sky News, Juncker sounded an optimistic note, saying 'we can have a deal'.
He said: 'We have to make sure that there will be no hard and physical border between the two parts of the Irish island and things have to be done on a level playing field.
'If these three objectives are met by the alternative arrangements, then we don't need the backstop.
'The backstop was never an instrument having been put in place for whatever will happen. No, it was put in place in order to preserve the rights of the internal market and of the island of Ireland.'
However, in the event of a no-deal Brexit, Juncker said there would have to be checks.
He added: 'I'm not an architect of new border stations. The British have to tell us exactly the architectural nature of this border.
'I don't like a border because after the Good Friday Agreement, and this Good Friday Agreement has to be respected in all its parts, the situation in Ireland has improved. We should not play with this.'
He said: 'An animal entering Northern Ireland without border control can enter without any kind of control the European Union via the southern part of the Irish island. This will not happen. We have to preserve the health and the safety of our citizens.'
He said the EU 'is in no way responsible for any kind of consequences entailed by the Brexit' as 'that's a British decision'.
He suggested that some MPs are 'forgetting about the history' of Northern Ireland and Ireland.
Juncker's meeting with Johnson in Luxembourg on September 16 came just hours before the country's prime minister Xavier Bettel criticised the Tory leader and left an empty podium for him at a press conference.
The European Commission president said: 'I don't know if this is helpful. I rather consider that this was not very helpful but it's his decision.'
Juncker also criticised former UK prime minister David Cameron over the build-up to the 2016 Brexit referendum, claiming he failed to explain the agreement reached with Brussels.
'We agreed the deal back in 2016, I think, between David and ourselves but this deal was never explained to the British public. Never.'
Juncker told El Pais that he believed 'we still have a chance to reach an agreement' and that Johnson is sincere in his desire for a deal.
'I don't share the views of those who think that Johnson is playing games with us and with himself,' he reportedly said.
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Cameron today warned Johnson that 'breaking the law is not a good idea'.
With the Supreme Court hoping to announce its decision this week on the legality of the Prime Minister's prorogation of Parliament, Cameron told Sky News' Sophy Ridge on Sunday: 'No deal is not a good idea. Breaking the law is not a good idea. Focus everything you've got on getting that deal, and that's what he's doing, to be fair to him.'
Foreign Secretary Dominic Raab said the Government will respect the Supreme Court's ruling on the Prime Minister's move to suspend Parliament in the run-up to Brexit.
Raab told BBC One's The Andrew Marr Show: 'Of course we will respect whatever the legal ruling is from the Supreme Court.
'But I think we are getting a little bit ahead of ourselves.'
Raab said: 'We will see what the Supreme Court will decide.
'We are confident, we wouldn't have appealed the case if we weren't confident in the position that the Government had taken.
'I can reassure you, of course we are going to abide by the Supreme Court judgment.'
Asked if the Government would prorogue Parliament again if it wins the case, Raab said: 'I think, let's wait and see what the first judgment decides and then we'll understand the lie of the land.'
Pressed on whether Northern Ireland could have different EU customs arrangements to the rest of the UK, Raab said: 'No, of course, that would be wrong.'
With the Supreme Court hoping to announce its decision this week on the legality of the Prime Minister's prorogation of Parliament, Cameron told Sky News' Sophy Ridge on Sunday: 'No deal is not a good idea. Breaking the law is not a good idea. Focus everything you've got on getting that deal, and that's what he's doing, to be fair to him.'
Foreign Secretary Dominic Raab said the Government will respect the Supreme Court's ruling on the Prime Minister's move to suspend Parliament in the run-up to Brexit.
Raab told BBC One's The Andrew Marr Show: 'Of course we will respect whatever the legal ruling is from the Supreme Court.
'But I think we are getting a little bit ahead of ourselves.'
Raab said: 'We will see what the Supreme Court will decide.
'We are confident, we wouldn't have appealed the case if we weren't confident in the position that the Government had taken.
'I can reassure you, of course we are going to abide by the Supreme Court judgment.'
Asked if the Government would prorogue Parliament again if it wins the case, Raab said: 'I think, let's wait and see what the first judgment decides and then we'll understand the lie of the land.'
Pressed on whether Northern Ireland could have different EU customs arrangements to the rest of the UK, Raab said: 'No, of course, that would be wrong.'
