(FILES) This file photo taken on July 27, 2016 shows Philippine President Rodrigo Duterte (R) greeting US Ambassador to the Philippines Philip S. Goldberg (L) as US Secretary of State John Kerry looks on during his visit to the Malacanang presidential palace in Manila. The Philippines' firebrand President Rodrigo Duterte has sparked a fresh diplomatic row with his colourful language, calling the US ambassador "gay" in comments that prompted Washington to summon Manila's envoy to complain. In the latest of series of tirades, Duterte used a local Tagalog language homophobic slur to express his displeasure with US Ambassador Philip Goldberg in televised comments made on August 5, 2016. / AFP PHOTO / POOL / Aaron FavilaAARON FAVILA/AFP/Getty Images

U.S. Democratic presidential candidate Hillary Clinton in Washington August 5, 2016. REUTERS/James Lawler Duggan

(FILES) This file photo taken on October 16, 2013 shows US Senators John McCain (2nd L) and Susan Collins (C)as they talk to reporters while heading to the Senate floor on Capitol Hill October in Washington, DC. More Republicans broke ranks August 9, 2016 with their party's White House nominee Donald Trump, issuing dire warnings that his recklessness and lack of policy chops would put the United States in danger. Those tough comments drew a sharp reply from Trump, who painted the group as "nothing more than the failed Washington elite looking to hold onto their power" and saying they should be "held accountable" for making the world less safe. Influential US Senator Susan Collins then piled on, saying the nominee was "unworthy" of America's highest elective office and would not receive her support. / AFP PHOTO / BRENDAN SMIALOWSKIBRENDAN SMIALOWSKI/AFP/Getty Images

U.S. Export-Import Bank President Fred Hochberg testifies before a House Financial Services Committee hearing on the Export-Import Bank's reauthorization, on Capitol Hill in Washington June 3, 2015. REUTERS/Jonathan Ernst - RTR4YP2M

WASHINGTON, DC - AUGUST 07: The presidents play volleyball in the presidents race during the game between the Washington Nationals and the San Francisco Giants at Nationals Park on August 7, 2016 in Washington, DC. (Photo by Greg Fiume/Getty Images)

WASHINGTON, DC - AUGUST 6: (AFP OUT) U.S. President Barack Obama points towards the assembled press as he and first lady Michelle Obama depart the White House August 6, 2016 in Washington, DC. The family is traveling to travel to Marthas Vineyard, Massachusetts for their annual two week vacation. (Photo by Ron Sachs-Pool/Getty Images) *** BESTPIX ***

WASHINGTON, DC - AUGUST 6: (AFP OUT) U.S. President Barack Obama salutes the Marien Guard as he and first lady Michelle Obama depart the White House August 6, 2016 in Washington, DC. The family is traveling to travel to Marthas Vineyard, Massachusetts for their annual two week vacation. (Photo by Ron Sachs-Pool/Getty Images)

WASHINGTON, DC - AUGUST 6: (AFP OUT) U.S. President Barack Obama and first lady Michelle Obama depart the White House August 6, 2016 in Washington, DC. The family is traveling to travel to Marthas Vineyard, Massachusetts for their annual two week vacation. (Photo by Ron Sachs-Pool/Getty Images)