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Anti-Brexit, pro-European Union Remain supporters wave flags as they travel up and down the River Thames, outside the Houses of Parliament, in London, Britain. Image Credit: Reuters

London The UK’s decision to leave the European Union was “stupid” and only the will of the British people can stop it, Martin Selmayr, the chief of staff to European Commission President Jean-Claude Juncker said.

“Brexit is bad, and it’s a stupid decision,” Selmayr said at a conference in Brussels on Monday. “The only people who can reverse it would be the British people and I am not a dreamer, I am a realist. Brexit will happen on March 29, 2019.”

German official Selmayr, one of the most powerful people in the EU hierarchy, was speaking two days after the bloc’s chief Brexit negotiator, Michel Barnier, said British people need to be “educated” about the price they’ll pay for their decision, according to reports on the BBC.

The UK and EU are embroiled in increasingly bad-tempered negotiations over the terms of Britain’s withdrawal. The British government is refusing to accept that it has financial obligations beyond its regular annual membership fees; in return, the EU is refusing to open talks on a future trade arrangement.

Selmayr said that while it was “legally” possible for the UK to reverse its decision, “it would be arrogant of us” to say the EU could force it to happen.

“The door of the European Union after March 2019 will always be open, and to all of our British friends, of course that is something that we humanly wish,” Selmayr said. “But politically at the moment this option is not on the table.”

Although he has no direct role in the negotiations, Selmayr has commented sporadically about Brexit since the referendum in 2016. He has said the divorce won’t be a success for Britain, took to Twitter to complain about a London decision to delay a routine review of the EU’s budget in the run-up to June’s general election and was widely blamed in the UK and Germany for leaking details of a confidential dinner in April attended by him, Juncker and Prime Minister Theresa May.

Time is running out for the UK to get a deal on arrangements for its departure from the EU, with complex separation issues, the money argument and a plan for a transition period far from being resolved. It’ll leave the bloc in 19 months whether it has managed to get a deal or not.

Barnier was quoted on the BBC on Sunday as saying the EU intended “to teach people” in the UK about what leaving the bloc’s single market means.

“There are extremely serious consequences of leaving the single market and it hasn’t been explained to the British people,” Barnier said Saturday at the Ambrosetti forum in Cernobbio, Italy, according to the BBC. The European Commission declined to confirm the comments were made, citing off-the- record rules imposed for the talk at the forum.