must accept plans for a Canada-style trade deal or face a leadership challenge. Senior figures say it would be impossible for her to try to further negotiate on her Chequers proposals if they are rejected by parliament or the EU. Instead, she would be told
Conservative Brexiteers are giving Theresa May an ultimatum, that if her negotiating strategy fails she
only full acceptance of the kind of deal put forward by Boris Johnson would allow her to avoid a Tory vote of no confidence. Ms May will chair cabinet on Tuesday and is expected to present further tweaks to her proposal to end the Brussels gridlock.