Sadiq Khan has suggested a second vote on the European Union might be required if MPs should vote to reject a deal agreed during the Brexit negotiations.
The Mayor of London said questions would be raised if MPs and peers in the House of Lords didn’t back an agreement brokered by Theresa May.
In an interview with BBC Radio 4, Khan – who supported the Remain campaign - made clear he accepted the results of the referendum in June 2016 - but said a second vote would depend on the final decision by Parliament.
The London Mayor also called for urgent action to negotiate a transition period, saying businesses in the UK were not bluffing about their plans to move overseas if no clarity was given over the situation post-Brexit.
A number of businesses, including several banks, have already made clear their contingency plans to move overseas as a result of Brexit.
The Mayor’s comments come after a draft letter was penned to the Brexit Secretary, David Davis, from five key business lobby groups, urging him to finalise transitional agreements as soon as possible.