<span style="color: #222222;">US President Donald Trump arrived in Britain today for a three-day state visit during which he is to attend a banquet hosted by Queen Elizabeth II and meet outgoing Prime Minister Theresa May.   </span><br />'' <br />'' <span style="color: #222222;">On landing, Trump sent out a tweet calling London Mayor Sadiq Khan a "stone cold loser" for criticising Britain's decision to roll out the red carpet for the White House chief. </span><br />''  <br />