US President Donald Trump and US First Lady Melania Trump arrive for a concert at the Elbphilharmonie concert hall during the G20 Summit in Hamburg, Germany, on July 7, 2017. Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / Tobias SCHWARZ