LONDON (AP) - Britain’s former top finance official accused Prime Minister Boris Johnson’s Conservative government on Wednesday of steering the country toward a damaging no-deal Brexit that isn’t backed by Parliament or British voters.

Johnson, in turn, alleged that anti-Brexit U.K. politicians were collaborating with the European Union to block Britain’s exit from the bloc.

Philip Hammond, a Conservative legislator who stepped down as Treasury chief just before Johnson became prime minister last month, said “leaving the EU without a deal would be just as much a betrayal of the referendum result as not leaving at all.”

Hammond told the BBC that Johnson had moved from a tough negotiating stance to a “wrecking” one by insisting on changes to the withdrawal agreement between Britain and the EU that the bloc would not accept.

He said that while he believed Johnson wanted a deal, “there are other people around him whose agenda is different” - an apparent reference to advisers such as Dominic Cummings, one of the architects of the country’s 2016 decision to leave the EU.

Johnson has vowed that Britain will leave the EU on the scheduled date of Oct. 31 - just 11 weeks away - with or without a divorce deal. He is demanding the EU make major changes to the agreement the bloc made with his predecessor, Theresa May. The EU refuses to renegotiate, so a no-deal Brexit appears increasingly likely.

Johnson claimed Wednesday there was “a terrible kind of collaboration” between an intransigent EU and U.K. politicians who want to stymie Britain’s exit from the bloc.

“We need our European friends to compromise, and the more they think there’s a chance Brexit can be blocked in Parliament the more adamant they are of sticking to their positon,” Johnson said during a question-and-answer session on Facebook.

Many economists say leaving the EU without an agreement on the terms will trigger a recession and cause economic mayhem, with shortages of fresh food and other goods likely as customs checks snarl Britain’s ports.

Johnson and other Brexit supporters argue that any short-term turbulence will be outweighed by new economic opportunities once Britain leaves the 28-nation bloc and can strike trade deals around the world - notably with the United States. Critics note that the EU accounts for almost half of Britain’s trade and any new trade deals are likely years away.

Hammond criticized the government for perpetuating “myths” that the British people voted for a no-deal Brexit and that leaving the EU without a negotiated settlement would be painless.

“There is no mandate for leaving with no deal,” Hammond said. “It is absurd to suggest that the 52% of people that voted to leave the European Union, all voted to leave with no deal when, in fact … during the referendum campaign there was virtually no mention made by the leaders of that campaign at all of the possibility of leaving with no deal.

“A no-deal exit will cause significant harm to the U.K. economy and, potentially, irreparable damage to the union of the United Kingdom,” he added.

A parliamentary showdown over Brexit is looming when lawmakers return from their summer break in early September. Opposition legislators hope to take action to block a no-deal departure - either by passing legislation or by bringing down Johnson’s government and triggering an early election. To succeed, they will need to persuade Conservatives like Hammond to vote against his party’s government.

Johnson has refused to rule out suspending Parliament if legislators try to delay or prevent Brexit. Hammond said that would “provoke a constitutional crisis.”

House of Commons Speaker John Bercow, who controls the day-to-day business of Parliament, said he would seek to prevent the prime minister from overriding Parliament.

“If there is an attempt to circumvent, to bypass or - God forbid - to close down Parliament, that is anathema to me,” Bercow told the Edinburgh Fringe Festival in comments reported by the Herald newspaper. “I will fight with every breath in my body to stop that happening.”

There are also battles over Brexit in the courts.

An anti-Brexit advocate who is trying to prosecute Johnson for allegedly lying during the 2016 EU membership referendum was refused permission Wednesday to take his case to Britain’s Supreme Court. Marcus Ball is trying to bring a private prosecution against Johnson over his claim that the U.K. sends 350 million pounds ($422 million) a week to the EU. The net figure is about half that.

Ball was seeking to overturn a lower court’s decision not to issue a summons for Johnson to appear in court to face allegations of misconduct in public office. Ball said he was “not giving up” and would appeal directly to the Supreme Court for permission to bring the case.

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Follow AP’s full coverage of Brexit and British politics at: https://www.apnews.com/Brexit

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