ANALYSIS: US President Barack Obama had just wrapped up a meeting with British Prime Minister David Cameron in 2011 when they took a detour, visiting a school in South London where they engaged a pair of students in a table tennis doubles match.
The ping-pong diplomacy served a political purpose - presenting the two leaders as partners in touch with the day-to-day lives of ordinary Britons. Former George W. Bush aides recall the 43rd president attending church in Beijing, taking a safari in Botswana and dining in a Tokyo restaurant. Such cultural moments have long been a staple of foreign trips for US presidents.
Not so much for President Donald Trump. Hewing to a formal itinerary limited to working sessions with Prime Minister Theresa May and tea with the Queen, Trump has avoided interacting with the public at large, as on his previous foreign trips.
"Most presidents, when they go abroad, are trying to win hearts and minds for the United States' democratic ways, so they are always in salesman mode," said Douglas Brinkley, a presidential historian. "Trump is trying to smash institutions and orchestrate a grand realignment of power politics."
Tommy Vietor, a White House spokesman under Obama, said the aim of getting the boss into the public was to "show another side of the president as more relatable with the goal of wanting the US to be popular abroad. It helps us advance our priorities and convince foreign governments to support initiatives we have."