U.S. President Barack Obama holds up a copy of the Colombian peace agreement given to him by Colombian President Juan Manual Santos during their meeting in New York September 21, 2016. REUTERS/Kevin Lamarque

U.S. President Barack Obama shakes hands with Colombian President Juan Manual Santos during their meeting in New York September 21, 2016. REUTERS/Kevin Lamarque

U.S. President Barack Obama receives a copy of the Colombian peace agreement during his meeting with Colombian President Juan Manual Santos in New York September 21, 2016. REUTERS/Kevin Lamarque

French riot policemen stand guard at the entrance of the "Jungle" as dozens of migrants try to storm lorries which are heading towards the ferry terminal in Calais, France, September 21, 2016. REUTERS/Pascal Rossignol

A model presents a creation at the Gucci fashion show during Milan Fashion Week Spring/Summer 2017 in Milan, Italy, September 21, 2016. REUTERS/Max Rossi

A model presents a creation at the Gucci fashion show during Milan Fashion Week Spring/Summer 2017 in Milan, Italy, September 21, 2016. REUTERS/Alessandro Garofalo

A model presents a creation at the Gucci fashion show during Milan Fashion Week Spring/Summer 2017 in Milan, Italy, September 21, 2016. REUTERS/Max Rossi

A model presents a creation at the Gucci fashion show during Milan Fashion Week Spring/Summer 2017 in Milan, Italy, September 21, 2016. REUTERS/Max Rossi