President Barack talks with participants after convening a meeting in the Oval Office on the ongoing response to the Zika virus, May 20, 2016. Pictured clockwise from left: Health and Human Services Secretary Sylvia Mathews Burwell; Dr. Tom Frieden, Director of the Centers for Disease Control and Prevention; Dr. Anthony Fauci, Director of The National Institute of Allergy and Infectious Diseases at the National Institute of Health; Senior Advisor Valerie Jarrett; Cecilia Muñoz, Domestic Policy Council Director; Shaun Donovan, Director, Office of Management and Budget; and Amy Pope, Deputy Homeland Security Advisor. In the background, Vice President Joe Biden talks with Amy Rosenbaum, Director of Legislative Affairs. (Official White House Photo by Pete Souza)

President Barack Obama walks out of the Oval Office to the White House Colonnade, May 19, 2016. (Official White House Photo by Pete Souza)

President Barack Obama makes a point during a meeting with senior staff in the Roosevelt Room of the White House, May 18, 2016. (Official White House Photo by Pete Souza)

President Barack Obama and his Boys and Girls Clubs of America National Youth of the Year guests react to comments by Alora Kionne Allen, center, during a visit to the Oval Office, May 17, 2016. The Youth of the Year are, from left, Brooke Grand, Northeast; Courtney Patterson, Southwest; Emily Carvajal, Pacific; Rian-Simone Harris, National Military; Alora Kionne Allen, Midwest; Whitney Stewart, Southeast; along with club officials, Jim Clark, President and CEO; Julie Teer, Chief Development and Public Affairs; and Myron Gray, Board Chair-Elect. (Official White House Photo by Pete Souza)