US President Barack Obama (L) welcomes Prime Minister Lee Hsien Loong of Singapore to the White House in Washington, DC on August 2, 2016. / AFP PHOTO / YURI GRIPASYURI GRIPAS/AFP/Getty Images

Singapore's Prime Minister Lee Hsien Loong speaks alongside US President Barack Obama during a State Arrival ceremony on the South Lawn of the White House in Washington, DC, August 2, 2016. / AFP PHOTO / SAUL LOEBSAUL LOEB/AFP/Getty Images

Singapore Prime Minister Lee Hsien Loong takes a photo with his phone while greeting guests with US President Barack Obama during an arrival ceremony on the South Lawn of the White House August 2, 2016 in Washington, DC. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

Singapore Prime Minister Lee Hsien Loong (L) and US President Barack Obama stand during an arrival ceremony on the South Lawn of the White House August 2, 2016 in Washington, DC. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

US President Barack Obama (R), First lady Michelle Obama (2nd L), Prime Minister Lee Hsien Loong and Mrs. Lee Hsien Loong of Singapore wave during an arrival ceremony at the White House in Washington, DC on August 2, 2016. / AFP PHOTO / YURI GRIPASYURI GRIPAS/AFP/Getty Images

US President Barack Obama (R) welcomes Prime Minister Lee Hsien Loong of Singapore to the White House in Washington, DC on August 2, 2016. / AFP PHOTO / YURI GRIPASYURI GRIPAS/AFP/Getty Images

US President Barack Obama (R), First lady Michelle Obama (2nd L), Prime Minister Lee Hsien Loong and Mrs. Lee Hsien Loong of Singapore wave during an arrival ceremony at the White House in Washington, DC on August 2, 2016. / AFP PHOTO / YURI GRIPASYURI GRIPAS/AFP/Getty Images

Singapore Prime Minister Lee Hsien Loong (L) and US President Barack Obama greet guests during an arrival ceremony on the South Lawn of the White House August 2, 2016 in Washington, DC. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images