Members of the King's Troop Royal Horse Artillery fire a 82-gun double gun salute in Green Park in central London on June 3, 2019 to mark the beginning of the State Visit of US President Donald Trump and US First Lady Melania Trump and the 66th anniversary of the Coronation of Queen Elizabeth II. - Britain rolled out the red carpet for US President Donald Trump on June 3 as he arrived in Britain for a state visit already overshadowed by his outspoken remarks on Brexit. (Photo by Tolga AKMEN / AFP)