Yalena Leuliette, 7, of Greenbelt, Md., throws seeds from a cattail plant up in the air as she plays while visiting the Kenilworth Aquatic Gardens in northeast Washington, on Sunday, August 9, 2015. Leuliette visits the public garden with her parents a few times a year. (Photo by Jacquelyn Martin/AP Photo)





Snow billows in the air as the Marine One helicopter, carrying President Barack Obama, lands on the South Lawn of the White House, on his return from Chicago, Thursday, February 19, 2015, in Washington. (Photo by Jacquelyn Martin/AP Photo)





Lucas Olivo, 6, of Cheverly, Md., opens his mouth wide while running through a wall of water at Yards Park in Washington, on Thursday, June 21, 2012. (Photo by Jacquelyn Martin/AP Photo)





An eight-week-old female lion cub swims through fall leaves during a swim test at the National Zoo in Washington, Tuesday, October 26, 2010. The test was to make sure the four cubs will be safe around the water feature when they are put on public display, which is expected to take place in late December. The test was very successful according to the lion keepers. (Photo by Jacquelyn Martin/AP Photo)





President Barack Obama kisses first lady Michelle Obama during their dance at the Commander-in-Chief Inaugural Ball at the Washington Convention Center during the 57th Presidential Inauguration on Monday, January 21, 2013, in Washington. (Photo by Jacquelyn Martin/AP Photo)





Jung Ha-yoon, 2, appears to be stuck inside a ceramic container while playing with other children at the traditional sports square during the “Taste Korea! Korean Royal Cuisine Festival” held at Unhyeon Palace, also known as Unhyeongung Royal Residence, in Seoul, South Korea, on Tuesday, October 1 2013. (Photo by Jacquelyn Martin/AP Photo)





A girl reacts as President Barack Obama greets her and others in the crowd after speaking about payday lending, at Lawson State Community College in Birmingham, Ala., Thursday, March 26, 2015. (Photo by Jacquelyn Martin/AP Photo)





With the Jefferson Memorial in the background, Steven Paska, 26, right, of Arlington, Va., kneels as he asks Jessica Deegan, 27, his girlfriend of two years, to marry him, near cherry blossom trees in peak bloom along the tidal basin in Washington, Thursday, April 10, 2014. (Photo by Jacquelyn Martin/AP Photo)





Silhouetted by a stage light, Secretary of State Hillary Rodham Clinton speaks at the University of the Western Cape about U.S.-South Africa partnership, Wednesday, August 8, 2012, in Cape Town, South Africa. (Photo by Jacquelyn Martin/AP Photo)





A child cools off in a wall of water on the first day of summer, Sunday, June 21, 2015, at Yards Park in Washington. (Photo by Jacquelyn Martin/AP Photo)