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WASHINGTON, DC - AUGUST 02: US President Barack Obama and Prime Minister Lee Hsien Loong of Singapore during official welcoming ceremonies on the South Lawn of the White House on August 2, 2016 in Washington, DC . Lee is on a State Visit to the United States. (Photo by Pete Marovich-Pool/Getty Images)

WASHINGTON, DC - AUGUST 02:  US President Barack Obama and Prime Minister Lee Hsien Loong of Singapore during official welcoming ceremonies on the South Lawn of the White House on August 2, 2016 in Washington, DC . Lee is on a State Visit to the United States.   (Photo by Pete Marovich-Pool/Getty Images)

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WASHINGTON, DC - AUGUST 02: Prime Minister Lee Hsien Loong of Singapore greets guests during official welcoming ceremonies on the South Lawn of the White House on August 2, 2016 in Washington, DC . Lee is on a State Visit to the United States. (Photo by Pete Marovich-Pool/Getty Images)

WASHINGTON, DC - AUGUST 02:  Prime Minister Lee Hsien Loong of Singapore greets guests during official welcoming ceremonies on the South Lawn of the White House on August 2, 2016 in Washington, DC . Lee is on a State Visit to the United States.   (Photo by Pete Marovich-Pool/Getty Images)

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WASHINGTON, DC - AUGUST 02: Prime Minister Lee Hsien Loong of Singapore greets guests during official welcoming ceremonies on the South Lawn of the White House on August 2, 2016 in Washington, DC . Lee is on a State Visit to the United States. (Photo by Pete Marovich-Pool/Getty Images)

WASHINGTON, DC - AUGUST 02:  Prime Minister Lee Hsien Loong of Singapore greets guests during official welcoming ceremonies on the South Lawn of the White House on August 2, 2016 in Washington, DC . Lee is on a State Visit to the United States.   (Photo by Pete Marovich-Pool/Getty Images)

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WASHINGTON, DC - AUGUST 02: US President Barack Obama and Prime Minister Lee Hsien Loong of Singapore make their way to greet guests during official welcoming ceremonies on the South Lawn of the White House on August 2, 2016 in Washington, DC . Lee is on a State Visit to the United States. (Photo by Pete Marovich-Pool/Getty Images)

WASHINGTON, DC - AUGUST 02:  US President Barack Obama and Prime Minister Lee Hsien Loong of Singapore make their way to greet guests during official welcoming ceremonies on the South Lawn of the White House on August 2, 2016 in Washington, DC . Lee is on a State Visit to the United States.   (Photo by Pete Marovich-Pool/Getty Images)

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WASHINGTON, DC - AUGUST 02: Prime Minister Lee Hsien Loong of Singapore and meet in the Oval Office following a State Welcome Ceremony on the South Lawn of the White House on August 2, 2016 in Washington, DC . Lee is on a State Visit to the United States. (Photo by Pete Marovich-Pool/Getty Images)

WASHINGTON, DC - AUGUST 02:  Prime Minister Lee Hsien Loong of Singapore and meet in the Oval Office following a State Welcome Ceremony on the South Lawn of the White House on August 2, 2016 in Washington, DC . Lee is on a State Visit to the United States.   (Photo by Pete Marovich-Pool/Getty Images)