Former British Defence Secretary Sir Michael Fallon has launched a scathing attack on Theresa May’s Brexit proposal, saying it is doomed and must be renegotiated.

The attack is a blow to May, who is struggling to muster support for the plan, which will be voted on in Parliament on December 11.

Opponents of the deal, which include US President Donald Trump, said it will keep the UK too closely tied to the EU, hampering future trade deals and minimising their value.