British lawmakers from both the ruling Conservatives and opposition Labour on Sunday said they were looking at ways to prevent the country’s next prime minister pursuing a no-deal Brexit against parliament’s wishes.

Boris Johnson, the frontrunner to succeed Theresa May as prime minister this month, has said Britain must leave the European Union on Oct. 31 with or without a deal.

He may find his hands tied, however, as the Conservatives do not have a majority in parliament and most lawmakers in parliament oppose a no-deal Brexit.

May’s Brexit deal was rejected three times by parliament due to rebellions within her own party and opposition to it from Northern Ireland’s Democratic Unionist Party (DUP), who prop up the Conservative government.

Labour’s trade spokesman Barry Gardiner said his party would call a no confidence vote in the government when it believed enough Conservatives would support it. Several Conservatives have said they would consider voting to try to bring down a government which was pursuing a ‘no deal’.

Other Conservatives said on Sunday they were looking at ways they could try and block a no-deal exit through legislation.

“We will call a no confidence vote when we believe that those Conservative members of parliament who have said that they would support a no confidence motion in the government in order to stop a no deal are likely to support it,” Gardiner told Sky News.

Asked if Labour was having conversations with those lawmakers, Gardiner said “Of course”.

Conservative lawmaker Sam Gyimah, who ran for the party’s leadership but withdrew before voting began, told Sky News that voting against the government was the “nuclear option” and he did not intend to do so.

Gyimah, who supports holding a second referendum on Brexit, said there were 30 or more Conservative lawmakers who would back “legislative options” to try to block a no-deal Brexit.

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