Donald Trump has said he will speak to Theresa May about the Salisbury spy poisoning on Tuesday, adding: 'It seems to me they think like it’s Russia [behind the attack on Sergei Skripal] and I would certainly take that finding as fact. If we agree with them, we will condemn Russia or whoever it may be.'

The British prime minister’s announcement about Russian involvement in the incident has prompted reaction around the world, although mixed messages had been coming from the White House. Rex Tillerson, the US secretary of state, who has been fired by Trump, had strongly backed May and the UK government’s assessment about it being 'highly likely' that Russia ordered the attack