British Prime Minister Theresa May was scrambling on Monday to clinch concessions from the European Union (EU) in a last-ditch attempt to avoid another humiliating defeat in parliament of her deal to exit the bloc.

The EU’s chief Brexit negotiator Michel Barnier said that negotiations to break a deadlock on a deal to leave the bloc are now between May and members of her parliament.

Just 18 days before the United Kingdom is due to leave the EU, there is still no ratified divorce deal and talks with the bloc stalled over the weekend as May felt she was unable to break the political deadlock in London.

In a day of frenetic diplomacy ahead of a Tuesday parliamentary vote on her deal, May spoke to European Commission President Jean-Claude Juncker in an effort to find a way through the Brexit maze.

May, who rejected a Brexit compromise hashed out in Brussels on Saturday, was due to travel to Strasbourg later on Monday, Irish Foreign Minister Simon Coveney said. Citing officials in May’s office, Sky News also reported she would travel to Strasbourg. May’s office did not confirm the trip. “The negotiations are ongoing. The British prime minister is travelling to Strasbourg this evening I understand to try to finalise an agreement if that’s possible,” Coveney told reporters in Dublin.

May’s spokesman said a “meaningful” parliamentary vote on her deal would go ahead, even though talks with the EU are deadlocked, and the motion was to be published later on Monday. The exact vote format was not immediately clear.

European officials expressed frustration with May’s attempts to secure concessions with so little time left before Britain is due to leave on March 29.

EU ambassadors were told by the bloc’s Brexit negotiators that a possible compromise was on the table but May was unable to convince her ministers so she turned it down.

Sterling see-sawed on Brexit news, falling in early trade on speculation that May could cancel the vote in parliament but later rising on news that May could travel to Strasbourg. It was trading at $1.3079 at 1500 GMT.

The United Kingdom’s tortuous crisis over EU membership is approaching its finale with an extraordinary array of options including a delay, a last-minute deal, a no-deal Brexit, a snap election or even another referendum. The country voted to leave the EU in a 2016 plebiscite.

The ultimate outcome remains unclear, though most diplomats and investors say Brexit will define the United Kingdom’s prosperity for generations to come.

Unless May can strike a deal she can sell to sceptical British lawmakers, the deadlocked talks effectively open up the prospect of either a last-minute deal, probably around the time of a EU summit on March 21-22, or a delay to Brexit.

Parliament rejected May’s deal by 230 votes on Jan.15, prompting her to return to Brussels in search of changes to the so-called Irish backstop - an insurance policy to prevent the return of a hard border between Ireland and Northern Ireland.

Many British lawmakers object to the backstop on the grounds that it could leave Britain subject to EU rules indefinitely and cleave Northern Ireland away from the rest of the United Kingdom.

But the EU has repeatedly said it does not want to reopen the divorce deal, officially known as the Withdrawal Agreement, and the British government’s top lawyer has failed to find a legal fix.

“We’re very clear that the Withdrawal Agreement can’t change but we want to try to be helpful in terms of providing the clarity and reassurance that’s needed in Westminster that the backstop is intended to be temporary,” Ireland’s Coveney said.

“No one is looking to trap anyone anywhere.”

In Brussels, diplomats and officials said Britain would face EU demands for billions of euros in cash if it fails to strike a Brexit deal.

May offered lawmakers the vote on Tuesday on what she had hoped would be a revised deal. But with no major changes yet secured, Brexit-supporting lawmakers said it would be defeated again.

Agencies