First Lady Michelle Obama participates in a roundtable discussion with Freida Pinto and students, in support of the Let Girls Learn initiative, at R.S. Caulfield Senior High School in Unification Town, Liberia, June 27, 2016. (Official White House Photo by Amanda Lucidon) First Lady Michelle Obama in Unification Town, Liberia

President Barack Obama jokes backstage with Mark Zuckerberg of Facebook, Dr. John L. Hennessy (left), President of Stanford University and other panelists before the 2016 Global Entrepreneurship Summit at Stanford Memorial Auditorium at Stanford University, Calif., June 24, 2016. (Official White House Photo by Pete Souza)

President Barack Obama meets in the Oval Office with (from left): Neil Eggleston, Counsel to the President; Cecilia Muñoz, Director of the Domestic Policy Council; Kristie Canegallo, Deputy Chief of Staff; and Chief of Staff Denis McDonough, before making a statement about the Supreme Court immigration ruling, June 23, 2016. (Official White House Photo by Pete Souza)

President Barack Obama delivers remarks before signing H.R. 2576, the Frank R. Lautenberg Chemical Safety for the 21st Century Act, as Dr. Lisa Huguenin and her husband, Marc, and son, Harrison, look on (reflected in mirror), in the Eisenhower Executive Office Building South Court Auditorium, June 22, 2016. Dr. Huguenin’s research about occupational exposure to toxic chemicals is also personal, as her family has experienced health problems that could be linked to environmental chemicals. She introduced the President before he spoke. (Official White House Photo by Pete Souza)