Britain's Queen Elizabeth II waits to greet US President Donald Trump as he arrives by helicopter (top) at Windsor Castle in Windsor, west of London, on July 13, 2018 for an engagement on the second day of Trump's UK visit. US President Donald Trump launched an extraordinary attack on Prime Minister Theresa May's Brexit strategy, plunging the transatlantic "special relationship" to a new low as they prepared to meet Friday on the second day of his tumultuous trip to Britain. / AFP PHOTO / POOL / Ben STANSALL