Boris Johnson has been warned by senior Brexiteers including David Davis that they might not support his exit deal if he only succeeds in stripping out the Northern Ireland backstop.

David Davis, the former Exiting the European Union secretary, told The Telegraph's Chopper's Brexit Podcast that Mr Johnson would also have agree not to pay the full £39billion Brexit bill and set a time limit on the jurisdiction of the European Court of Justice.

Mr Johnson has identified the removal of the backstop - which will keep the UK in a customs union and the single market after Brexit until a solution is found to prevent a hard border - as a key part of his plans to take the UK out of the EU by Oct 31.

Earlier this week the Prime Minister told EU council president Donald Tusk in a letter that he was "confident that our Parliament would be able to act rapidly if we were able to reach a satisfactory agreement which did not contain the 'backstop'."