Rebellious members of the British Parliament are plotting to find a way to force a second Brexit referendum, to give citizens the chance to vote again on whether or not to leave the European Union.

Several MPs are working on a plan that could seize control of the Brexit agenda from Prime Minister Boris Johnson, the Guardian reported.

Parliament voted Tuesday to support the deal Johnson reached with the EU, but they declined to fast-track the plan in time to leave the 28-nation political and economic union by the old deadline of Oct. 31. The EU in turn agreed Friday to extend the deadline, but didn’t set a new date, Reuters reported.

Johnson, a Conservative, has called for a snap election, which Parliament is slated to vote on Monday. Opposition leader Jeremy Corbyn of the Labour Party said he will support an election only if Johnson pledges the UK will not exit the EU with no deal, a possibility that could significantly damage the economy.

The EU did not set new deadline in part because of the call for a new election.

Support for a second referendum “ebbs and flows,” Labour MP Peter Kyle told the Guardian, but that presently “the tide is coming back on it” among MPs.

Last Saturday, hundreds of thousands marched in the streets of London calling for a second referendum.

Backing for a new vote on leaving the EU may grow stronger still following the leak of a government document that says that commitments on workers’ rights and environmental protections are open for interpretation when the UK separates.

The paper, revealed by the Financial Times, appears to contradict statements from Johnson that the UK was committed to “the highest possible standards” for workers’ rights and environmental standards.

Johnson’s deal allows the UK to set its own regulatory standards after a transition period that will stretch through 2022 at the latest.

A government spokesperson told the paper the UK government “has no intention of lowering the standards of workers’ rights or environmental protection after we leave the EU and we already exceed EU minimum standards in areas such as maternity leave, shared parental leave and greenhouse gas targets.”

But Jenny Chapman, Labour’s shadow Brexit minister, told the FT: “These documents confirm our worst fears. Boris Johnson’s Brexit is a blueprint for a deregulated economy, which will see vital rights and protections torn up.”

The EU has warned that a strong trade deal with Britain will depend on it continuing to uphold robust rules.

With Post wires