Theresa May has seized on the “optimism” of Donald Trump and world leaders over Brexit to face down a growing rebellion from Cabinet colleagues and backbenchers.

The Prime Minister revealed that the heads of the biggest economies globally had agreed to deepen trade with the UK in a “powerful vote of confidence” in its post-Brexit future.

President Trump personally assured Mrs May that a “powerful” trade deal between the US and the UK would be completed “very, very quickly”, as they met at the G20 in Hamburg.