LONDON (AP) — Brexit negotiations between Britain with the European Union will continue through the weekend, the country's chief law officer said Thursday as the U.K. scrambled to secure changes to the divorce deal before a vote in Parliament next week.

With Britain's scheduled departure from the bloc a little more than three weeks away, the EU says "difficult" talks have failed to produce a breakthrough because British proposals are unrealistic.

"We are waiting for a proposal from the British government," French Europe Minister Natalie Loiseau told BBC radio. "We have heard what you don't want; we are willing to know what you want."

U.K. Attorney General Geoffrey Cox, however, insisted that said "focused, detailed and careful discussions" would resume "shortly."

"We are discussing text with the European Union," he said. "I am surprised to hear the comments that have emerged over the last 48 hours the proposals are not clear. They are as clear as day and we are continuing to discuss them."

Britain is due to leave the EU on March 29, but its Parliament resoundingly rejected in January the divorce deal that lays out the terms of an orderly departure and a transition period for businesses to adjust to new trade rules.

British lawmakers are due to vote again Tuesday on the deal, including any changes the government manages to secure. If it is rejected again, lawmakers will vote on whether to leave the EU without an agreement — an idea likely to be rejected — or to ask the EU to delay Brexit.

Treasury chief Philip Hammond warned pro-Brexit lawmakers that they should "think very, very carefully" about the consequences of defeating May's deal. He said "they run the risk of us moving away from their preferred course of action if we don't get this deal through on Tuesday."

British concerns about the divorce deal center on a provision designed to keep an open border between the U.K.'s Northern Ireland and EU member Ireland. The mechanism, known as the backstop, is a safeguard that would keep the U.K. in a customs union with the other 27 EU countries in order to remove the need for checks until a permanent new trading relationship is in place.

Brexit-supporting lawmakers in the U.K. fear the backstop could be used to bind Britain to EU regulations indefinitely, and Prime Minister Theresa May wants to revise the deal to reassure opponents that it would only apply temporarily.

EU leaders insist that the legally binding Brexit withdrawal agreement can't be reopened, though they are willing to add "clarifications" to ease British concerns.

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