Prime Minister Theresa May defended her decision to ask archrival Jeremy Corbyn to help draft a new blueprint for Brexit, and warned the UK might never leave the European Union if he doesn\u2019t back a compromise plan. \u201cThe longer this takes, the greater the risk of the U.K. never leaving at all,\u201d May said in a statement. \u201cIt would mean letting the Brexit the British people voted for slip through our fingers. I will not stand for that.\u201d May is battling to contain a backlash from within her Conservative Party over her decision to work with Labour Party leader Corbyn, someone she\u2019s spent three years deriding. Coming up with an acceptable compromise to her own lawmakers in response to the 2016 referendum has been beyond her, and the deadlock shows no sign of being resolved by reaching out to the opposition. May badly needs a breakthrough in London before she travels to Brussels on Wednesday. She\u2019s requested an extension to the Brexit process until June 30, but says if MPs agree to a deal, the U.K. should be able to leave before European parliamentary elections are held May 23. Education Minister Nadim Zahawi told the BBC that taking part in those elections would be a \u201csuicide note\u201d for the Conservative Party. May sought to underline that both main political parties have a lot of common ground to secure an agreement. \u201cWe both want to end free movement, we both want to leave with a good deal, and we both want to protect jobs,\u201d she said. But her efforts to forge a compromise across political boundaries look to be dribbling into the sand. The Labour Party says May hasn\u2019t offered \u201creal change\u201d to her Brexit deal that Parliament has rejected three times - by chunky margins on each occasion. Labour\u2019s key demand is for a customs union with the EU. According to the Sunday Times, May is prepared to cede some ground. She\u2019ll offer to rewrite the government\u2019s withdrawal bill to make sure a customs arrangement is enshrined in law, a move that would be hard for a future euroskeptic PM to retract after May steps down. Also read: Brexit: UK PM Theresa May asks EU for further delay until June 30 Also, her aides have discussed offering Labour a seat in her delegation to Wednesday\u2019s EU summit, the newspaper reported. And while EU leaders aren\u2019t united on how long the extension should last, Irish Prime Minister Leo Varadkar told RTE on Saturday it would be \u201cextremely unlikely\u201d that one of the EU\u2019s 27 other countries would veto May\u2019s request.