US President Barack Obama speaks during a SelectUSA Summit June 20, 2016 in Washington, DC. The Summit is the highest-profile event that promotes foreign direct investment (FDI) in the United States. It provides an unparalleled opportunity to bring together companies from all over the world, economic development organizations from every corner of the nation, others working to facilitate investment in the United States, and high-level government officials. Participants can find the practical tools, information and connections they need to move investments forward. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

(FILES) This file photo taken on April 27, 2016 shows Trump campaign manager Corey Lewandowski as he waits for Republican US presidential hopeful Donald Trump to speak about foreign policy at the Mayflower Hotel in Washington, DC. Republican presidential hopeful Donald Trump has dropped his controversial campaign manager Corey Lewandowski, a spokeswoman told The New York Times on June 20, 2016, as the billionaire looks to reposition himself for the general election. "The Donald J. Trump Campaign for President, which has set a historic record in the Republican primary having received almost 14 million votes, has today announced that Corey Lewandowski will no longer be working with the campaign," spokeswoman Hope Hicks told the newspaper in a statement. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

TOPSHOT - Marine One with US President Barack Obama and the first family lands at Castle Airport June 19, 2016 in Merced County, California, to board Air Force One for their return to Washington, DC. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

WASHINGTON, DC - JUNE 19: U.S. President Barack Obama and daughter Sasha walk on the South Lawn of the White House June 19, 2016 in Washington, DC. The first family was returning from Yosemite National Park in California. (Photo by Olivier Douliery-Pool/Getty Images)

WASHINGTON, DC - JUNE 19: U.S. President Barack Obama, first lady Michelle Obama (2nd R) and daughters Malia (R) and Sasha walk on the South Lawn of the White House June 19, 2016 in Washington, DC. The first family was returning from Yosemite National Park in California. (Photo by Olivier Douliery-Pool/Getty Images)

WASHINGTON, DC - JUNE 19: U.S. President Barack Obama, first lady Michelle Obama (2nd R) and daughters Malia (R) and Sasha walk on the South Lawn of the White House June 19, 2016 in Washington, DC. The first family was returning from Yosemite National Park in California. (Photo by Olivier Douliery-Pool/Getty Images)

Marine One with US President Barack Obama and the first family lands at Castle Airport June 19, 2016 in Merced County, California, to board Air Force One for their return to Washington, DC. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

Former president of Bolivia Jorge Quiroga (L) speaks with former president of Peru Alejandro Toledo during a discussion on Venezuela and the OAS at The Center for Strategic and International Studies (CSIS) on June 17, 2016 in Washington, DC. / AFP PHOTO / Mandel NganMANDEL NGAN/AFP/Getty Images