People attend a protest against judicial reforms in Warsaw, Poland, July 24, 2017. REUTERS/Kacper Pempel

Lakesha Johnson (R), a homeless health care aide, embraces her 11-year-old daughter, Aja, in Philadelphia, Pennsylvania, U.S. April 26, 2017. Picture taken April 26, 2017. To match Special Report USA-STUDENTLOANS/ REUTERS/Mark Makela

White House senior advisor Jared Kushner and Ivanka Trump attend a joint press conference between U.S. President Donald Trump and Lebanese Prime Minister Saad al-Hariri in the Rose Garden of the White House in Washington, U.S., July 25, 2017. REUTERS/Carlos Barria

Fishermen attempt to catch game fish and sharks following large shoals of sardines in Margate, South Africa, July 25, 2017. REUTERS/Rogan Ward

A Yazidi boy, twelve year-old Imad Tammo rescued from Islamic State militants by the Iraqi army, draws in Sina neighbourhood outside of Duhok, Iraq July 25, 2017. REUTERS/Ari Jalal

Resident Woo Jong-il poses for photographs inside his private bunker at his house near the demilitarized zone separating the two Koreas in Paju, South Korea, July 14, 2017. Picture taken on July 14, 2017. REUTERS/Kim Hong-Ji

Vehicles that were destroyed by a burning wildfire are seen near a damaged home in Carros, near Nice, France, July 24, 2017. REUTERS/Eric Gaillard

Firefighters work to put out a forest fire in the village of Carvoeiro, near Castelo Branco, Portugal, July 25, 2017. REUTERS/Rafael Marchante

Senator John McCain (R-AZ), recently diagnosed with an aggressive form of brain cancer, departs after returning to the Senate to vote on health care legislation on Capitol Hill in Washington, U.S., July 25, 2017. REUTERS/Aaron P. Bernstein

German Chancellor Angela Merkel reacts as she arrives at the red carpet for the opening of the Bayreuth Wagner opera festival outside the Gruener Huegel (Green Hill) opera house in Bayreuth, Germany July 25, 2017. REUTERS/Michaela Rehle

Sen. Elizabeth Warren (D-MA) speaks to Senate Minority Leader Chuck Schumer (D-NY) on the Senate steps on Capitol Hill in Washington, U.S. July 25, 2017. REUTERS/Eric Thayer

A Hezbollah member kisses the coffin of Hezbollah fighter Mohammed Chouaib, during his funeral in Toul village, Lebanon, July 24, 2017. REUTERS/Ali Hashisho

A boy sits near rubble of damaged buildings in Arbin, a town in the Damascus countryside, Syria July 25, 2017. REUTERS/Bassam Khabieh

Fireflies seeking mates light up in synchronised bursts inside a forest at Santa Clara sanctuary near the town of Nanacamilpa, Tlaxcala state, Mexico, July 24, 2017. Picture taken July 24, 2017. REUTERS/Edgard Garrido

People buy food and other staple goods inside a supermarket in Caracas, Venezuela, July 25, 2017. REUTERS/Ueslei Marcelino

A waxing crescent moon rises over the lit Temple of Parthenon atop the ancient Acropolis hill in central Athens, Greece July 25, 2017. REUTERS/Yannis Behrakis

A protester shouts at U.S. President Donald Trump (bottom R) as he is removed from his rally with supporters in an arena in Youngstown, Ohio, U.S. July 25, 2017. REUTERS/Jonathan Ernst