WASHINGTON, DC - AUGUST 03: Participants in the Presidential Summit of the Mandela Washington Fellowship for Young African Leaders make photographs before a town hall event at the Omni Shoreham Hotel August 3, 2016 in Washington, DC. As part of Obama's Young African Leaders Initiative, the summit brought together 500 leaders, ages 25-35, from across Africa to the U.S. for 6 weeks of leadership training and mentoring at twenty universities and colleges to 'spur growth and prosperity, strengthen democratic governance, and enhance peace and security across Africa.' (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - AUGUST 03: Participants in the Presidential Summit of the Mandela Washington Fellowship for Young African Leaders pose for photographs before a town hall event at the Omni Shoreham Hotel August 3, 2016 in Washington, DC. As part of Obama's Young African Leaders Initiative, the summit brought together 500 leaders, ages 25-35, from across Africa to the U.S. for 6 weeks of leadership training and mentoring at twenty universities and colleges to 'spur growth and prosperity, strengthen democratic governance, and enhance peace and security across Africa.' (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - AUGUST 03: Participants in the Presidential Summit of the Mandela Washington Fellowship for Young African Leaders pose for photographs before a town hall event at the Omni Shoreham Hotel August 3, 2016 in Washington, DC. As part of Obama's Young African Leaders Initiative, the summit brought together 500 leaders, ages 25-35, from across Africa to the U.S. for 6 weeks of leadership training and mentoring at twenty universities and colleges to 'spur growth and prosperity, strengthen democratic governance, and enhance peace and security across Africa.' (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - AUGUST 02: U.S. first lady Michelle Obama and U.S. President Barack Obama wait for the arrival of Prime Minister Lee Hsien Loong of Singapore and his wife Ho Ching on the North Portico of the White House August 2, 2016 in Washington, DC. The Obamas are hosting the prime minister and his wife for an official state dinner. (Photo by Chip Somodevilla/Getty Images) ***BESTPIX***

WASHINGTON, DC - AUGUST 02: Chrisette Michele performs a song for President Obama, first lady Michelle Obama, Prime Minister Lee Hsien Loong, Madam Ho Ching at the White House on August 2, 2016 in Washington, DC. The Obamas are hosting the prime minister and his wife for an official state dinner. (Photo by Leigh Vogel-Pool/Getty Images)

WASHINGTON, DC - AUGUST 02: Chrisette Michele performs a song for President Obama, first lady Michelle Obama, Prime Minister Lee Hsien Loong, Madam Ho Ching at the White House on August 2, 2016 in Washington, DC. The Obamas are hosting the prime minister and his wife for an official state dinner. (Photo by Leigh Vogel-Pool/Getty Images)

WASHINGTON, DC - AUGUST 02: President Obama and first lady Michelle Obama welcome Prime Minister Lee Hsien Loong and Ho Ching at the North Portico of the White House August 2, 2016 in Washington, DC. The Obamas are hosting the prime minister and his wife for an official state dinner. (Photo by Leigh Vogel-Pool/Getty Images)

WASHINGTON, DC - AUGUST 02: Chrisette Michele performs a song for President Obama, first lady Michelle Obama, Prime Minister Lee Hsien Loong, Madam Ho Ching at the White House on August 2, 2016 in Washington, DC. The Obamas are hosting the prime minister and his wife for an official state dinner. (Photo by Leigh Vogel-Pool/Getty Images)