Alexis Tsipras, Prime Minister of Greece, prepares to address the 71st session of the United Nations General Assembly at the UN headquarters in New York on September 22, 2016. / AFP PHOTO / DOMINICK REUTERDOMINICK REUTER/AFP/Getty Images

Alexis Tsipras, Prime Minister of Greece, addresses the 71st session of the United Nations General Assembly at the UN headquarters in New York on September 22, 2016. / AFP PHOTO / DOMINICK REUTERDOMINICK REUTER/AFP/Getty Images

Alexis Tsipras, Prime Minister of Greece, addresses the 71st session of the United Nations General Assembly at the UN headquarters in New York on September 22, 2016. / AFP PHOTO / DOMINICK REUTERDOMINICK REUTER/AFP/Getty Images

Alexis Tsipras, Prime Minister of Greece, addresses the 71st session of the United Nations General Assembly at the UN headquarters in New York on September 22, 2016. / AFP PHOTO / DOMINICK REUTERDOMINICK REUTER/AFP/Getty Images

The logo of the U.S. National Security Agency is seen during a visit by U.S. President George W. Bush to the agency's installation in Fort Meade, Maryland, January 25, 2006. Bush met with workers and made remarks on American national security at the high-security installation, which he last visited in 2002. REUTERS/Jason Reed - RTR18ZAD

People vote in the U.S. presidential primary election at a polling station located in a grocery store in National City, California, United States, June 7, 2016. REUTERS/Mike Blake/File Photo

A poll worker places a mail-in ballot into a voting box as voters drop off their ballot in the U.S. presidential primary election in San Diego, California, United States, June 7, 2016. REUTERS/Mike Blake

Gov. Matt Bevin (R-KY) attends the National Rifle Association's NRA-ILA Leadership Forum during their annual meeting in Louisville, Kentucky, May 20, 2016. REUTERS/Aaron P. Bernstein