A worker adjusts European Union and U.S. flags at the start of the 2nd round of EU-US trade negotiations for Transatlantic Trade and Investment Partnership at the EU Commission headquarters in Brussels November 11, 2013. REUTERS/Francois Lenoir

Republican presidential nominee Donald Trump delivers remarks at the Shale Insight energy conference in Pittsburgh, Pennsylvania, U.S. September 22, 2016. REUTERS/Jonathan Ernst

Republican presidential nominee Donald Trump delivers remarks at the Shale Insight energy conference in Pittsburgh, Pennsylvania, U.S. September 22, 2016. REUTERS/Jonathan Ernst

U.S. Attorney for the Southern District of New York Preet Bharara speaks during a news conference about corruption and fraud involving New York state contracts, in New York City, U.S., September 22, 2016. REUTERS/Brendan McDermid

U.S. Attorney for the Southern District of New York Preet Bharara speaks during news conference about corruption and fraud involving New York state contracts, in New York City, U.S., September 22, 2016. REUTERS/Brendan McDermid

U.S. Attorney for the Southern District of New York Preet Bharara speaks during a news conference about corruption and fraud involving New York state contracts, in New York City, U.S., September 22, 2016. REUTERS/Brendan McDermid

The moon rises behind the skyline and financial district in Toronto, November 25, 2015. REUTERS/Mark Blinch

A midshipman fish’s head is shown in this undated handout photo. Margaret Marchaterre/Courtesy of Cornell University/Handout via REUTERS