US President Barack Obama hugs singer Janelle Monáe (R) during an Independence Day Celebration for military members and administration staff on July 4, 2016 in the East Room of the White House in Washington, DC. / AFP PHOTO / Mandel NGANMANDEL NGAN/AFP/Getty Images

US President Barack Obama (L) watches as singer Janelle Monáe (R) hugs Obama's daughter Malia on her birthday during an Independence Day Celebration for military members and administration staff on July 4, 2016 in the East Room of the White House in Washington, DC. / AFP PHOTO / Mandel NganMANDEL NGAN/AFP/Getty Images

US President Barack Obama hugs his daughter Malia on her birthday during an Independence Day Celebration for military members and administration staff on July 4, 2016 in the East Room of the White House in Washington, DC. / AFP PHOTO / Mandel NganMANDEL NGAN/AFP/Getty Images

FILE - JULY 02: Elie Wiesel, Holocaust survivor and author, has died at the age of 87 on July 02, 2016. Wiesel was a Nobel Peace Prize laureate and best known for his role in promoting Holocaust education. His memoir "Night" based off of his experience as a teenager in the Auschwitz concentration camp is one of the most well known books around the world. WASHINGTON - APRIL 23: U.S. President Barack Obama (R) and Elie Wiesel walk in the Hall of Remembrance at the Holocaust Museum April 23, 2012 in Washington, DC. Obama reportedly announced a new sanctions March 23, on Iran and Syria for entities and people using technology to target citizens. (Photo by Dennis Brack-Pool/Getty Images)

(FILES) This March 3, 2015, file photo shows Nobel peace laureate Elie Wiesel at the US Congress in Washington, DC. Wiesel, the Holocaust survivor, renowned writer and Nobel peace laureate who worked to keep alive the memory of Jews slaughtered during World War II, has died, Israel's Yad Vashem Holocaust centre said on July 2, 2016. / AFP PHOTO / NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images

(FILES) This file photo taken on March 3, 2015 shows Nobel laureate and Holocaust survivor Elie Wiesel as Israel's Prime Minister addresses a joint session of the US Congress at the US Capitol in Washington, DC. Wiesel, the Holocaust survivor, renowned writer and Nobel peace laureate who worked to keep alive the memory of Jews slaughtered during World War II, has died, the Yad Vashem Holocaust research centre said on July 2, 2016. A spokesman for the centre confirmed Wiesel's death to AFP, but had no further details. He was reported to be 87 and had been living in the United States. / AFP PHOTO / NICHOLAS KAMMNICHOLAS KAMM/AFP/Getty Images

WASHINGTON, DC - JULY 01: U.S. President Barack Obama speaks about the Zika virus during a meeting with health officials in the Oval Office at the White House, July 1, 2016 in Washington, DC. President Obama urged Congress to pass a Zika virus funding bill before going on break. Also pictured are, Secretary of Health and Human Services Sylvia Mathews Burwell, (2-L), Director of NIH/NIAID Dr. Anthony Fauci, (R), Director of the Centers for Disease Control and Prevention Dr. Tom Frieden. (L). (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - JULY 01: U.S. President Barack Obama speaks about the Zika virus during a meeting with health officials in the Oval Office at the White House, July 1, 2016 in Washington, DC. President Obama urged Congress to pass a funding bill to combat the Zika virus. (Photo by Mark Wilson/Getty Images)