A specialist trader works at his post on the floor of the New York Stock Exchange (NYSE) in New York City, U.S., September 15, 2016. REUTERS/Brendan McDermid

Traders work on the floor of the New York Stock Exchange (NYSE) in New York City, U.S., September 15, 2016. REUTERS/Brendan McDermid

A trader works on the floor of the New York Stock Exchange (NYSE) in New York City, U.S., September 15, 2016. REUTERS/Brendan McDermid

Japan's Defense Minister Tomomi Inada speaks during a news conference after National Security Council (NSC) meeting with prime minister Shinzo Abe and other ministers on a suspected nuclear test by North Korea, at Defense Ministry in Tokyo, Japan, September 9, 2016. REUTERS/Issei Kato

House Speaker John Boehner smokes at a picnic for Members of Congress, hosted by U.S. President Barack Obama and first lady Michelle Obama, on the South Lawn of the White House in Washington June 15, 2011. REUTERS/Larry Downing

Sergei Syrtsov of Russia in action during the Goodwill Games 99 kg clean-and-jerk weightlifting category July 23, 1994. Reuters photographer

Former House Speaker John Boehner (R-OH) addresses his colleagues prior to the election for the new Speaker of the U.S. House of Representatives on Capitol Hill in Washington October 29, 2015. REUTERS/Gary Cameron

People sit in front of the company logo of Baidu at its headquarters in Beijing December 17, 2014. REUTERS/Kim Kyung-Hoon/File photo