There is a constitutional and legal crisis about to break in the US any day now, and one of several stories breaking yesterday will appear in future history books as a pivotal moment that changed America forever. We just don't know yet which one it will be. Manoeuvres are underway by Donald Trump and his political and media allies to systematically dismantle the norms of US politics. It's very likely that the US political landscape will look dramatically different in one of two ways in coming weeks or months - either Special Investigator Robert Mueller will begin legal proceedings against the President of the United States for colluding with Russia to rig the Presidential election, or Donald Trump and congress will succeed in removing Mueller from the investigation, along with any trace of checks and balances preventing the US from becoming a de facto dictatorship. Neither of these outcomes can do anything other than hugely harm the UK/US "special relationship" a