Police and security personnel survey the area from the top of Winfield House, the residence of the US Ambassador, in London on June 3, 2019, as US President Donald Trump and US First Lady Melania Trump arrive aboard Marine One to begin a three-day State Visit to the UK. - 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 MANDEL NGAN / AFP)