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Head of the FPOe Strache and head of the OeVP Kurz address a news conference in Vienna

Head of the Freedom Party (FPOe) Heinz-Christian Strache (L) and head of the People's Party (OeVP) Sebastian Kurz address a news conference in Vienna, Austria, December 15, 2017. REUTERS/Leonhard Foeger

U.S. Attorney General Jeff Sessions holds a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington

U.S. Attorney General Jeff Sessions stands during a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington, U.S., December 15, 2017. REUTERS/Joshua Roberts

U.S. Attorney General Jeff Sessions holds a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington

U.S. Attorney General Jeff Sessions speaks during a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington, U.S., December 15, 2017. REUTERS/Joshua Roberts

U.S. Attorney General Jeff Sessions holds a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington

U.S. Attorney General Jeff Sessions stands during a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington, U.S., December 15, 2017. REUTERS/Joshua Roberts

Head of the FPOe Strache and head of the OeVP Kurz arrive for a news conference in Vienna

Head of the Freedom Party (FPOe) Heinz-Christian Strache (L) and head of the People's Party (OeVP) Sebastian Kurz arrive for a news conference in Vienna, Austria, December 15, 2017. REUTERS/Leonhard Foeger

U.S. Attorney General Jeff Sessions holds a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington

U.S. Attorney General Jeff Sessions stands during a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington, U.S., December 15, 2017. REUTERS/Joshua Roberts

U.S. Attorney General Jeff Sessions holds a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington

U.S. Attorney General Jeff Sessions stands during a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington, U.S., December 15, 2017. REUTERS/Joshua Roberts

U.S. Attorney General Jeff Sessions holds a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington

U.S. Attorney General Jeff Sessions stands during a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington, U.S., December 15, 2017. REUTERS/Joshua Roberts

U.S. Attorney General Jeff Sessions holds a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington

U.S. Attorney General Jeff Sessions is seen during a news conference to discuss "efforts to reduce violent crime" at the Department of Justice in Washington, U.S., December 15, 2017. REUTERS/Joshua Roberts

Head of the FPOe Strache and head of the OeVP Kurz address a news conference in Vienna

Head of the Freedom Party (FPOe) Heinz-Christian Strache (L) and head of the People's Party (OeVP) Sebastian Kurz address a news conference in Vienna, Austria, December 15, 2017. REUTERS/Leonhard Foeger

European Challenge Cup - Dragons vs Newcastle Falcons

Rugby Union - European Challenge Cup - Dragons vs Newcastle Falcons - Rodney Parade, Newport, Britain - December 15, 2017 Dragons' Ashton Hewitt in action with Newcastle Falcons' Simon Hammersley Action Images via Reuters/Andrew Boyers

European Challenge Cup - Dragons vs Newcastle Falcons

Rugby Union - European Challenge Cup - Dragons vs Newcastle Falcons - Rodney Parade, Newport, Britain - December 15, 2017 Dragons' Elliot Dee in action with Newcastle Falcons' Gary Graham (R) and Ben Sowrey Action Images via Reuters/Andrew Boyers

European Challenge Cup - Dragons vs Newcastle Falcons

Rugby Union - European Challenge Cup - Dragons vs Newcastle Falcons - Rodney Parade, Newport, Britain - December 15, 2017 Dragons' Hallam Amos in action with Newcastle Falcons' Joel Hodgson (L) and Ryan Burrows Action Images via Reuters/Andrew Boyers

European Challenge Cup - Dragons vs Newcastle Falcons

Rugby Union - European Challenge Cup - Dragons vs Newcastle Falcons - Rodney Parade, Newport, Britain - December 15, 2017 Dragons' Hallam Amos in action with Newcastle Falcons' Joel Hodgson (L) and Ryan Burrows Action Images via Reuters/Andrew Boyers

European Challenge Cup - Dragons vs Newcastle Falcons

Rugby Union - European Challenge Cup - Dragons vs Newcastle Falcons - Rodney Parade, Newport, Britain - December 15, 2017 Dragons' Gavin Henson in action with Newcastle Falcons' Sean Robinson (L) and Ben Sowrey Action Images via Reuters/Andrew Boyers

Euro Hockey Tour - Channel One Cup - Czech Republic v Canada

Ice Hockey - Euro Hockey Tour - Channel One Cup - Czech Republic v Canada - VTB Ice Palace, Moscow, Russia - December 15, 2017. The puck slides back out of the net on a goal by Czech Republic's Martib Erat after he scored against Canada. REUTERS/Alexei Kudenko/Pool

Euro Hockey Tour - Channel One Cup - Czech Republic v Canada

Ice Hockey - Euro Hockey Tour - Channel One Cup - Czech Republic v Canada - VTB Ice Palace, Moscow, Russia - December 15, 2017. Czech Republic's Tomas Mertl (R) celebrates a goal scored by team mate Vojtech Mozik against Canada. REUTERS/Alexei Kudenko/Pool

People attend the performance of the actor John Travolta at APEX Convention Center in Riyadh

People attend the performance of the actor John Travolta at APEX Convention Center in Riyadh, Saudi Arabia December 15, 2017. REUTERS/Faisal al Nasser

Actor John Travolta performs at APEX Convention Center in Riyadh

Actor John Travolta performs at APEX Convention Center in Riyadh, Saudi Arabia December 15, 2017. REUTERS/Faisal al Nasser

People attend the performance of actor John Travolta at APEX Convention Center in Riyadh

People attend the performance of actor John Travolta at APEX Convention Center in Riyadh, Saudi Arabia December 15, 2017. REUTERS/Faisal al Nasser

Brazil's new minister of political affairs Marun and Brazil's President Temer attend the swearing-in ceremony at the Planalto Palace in Brasilia

Brazil's new minister of political affairs Carlos Marun (L) and Brazil's President Michel Temer attend the swearing-in ceremony at the Planalto Palace in Brasilia, Brazil December 15, 2017. REUTERS/Adriano Machado

North Korea's Ambassador to the UN Ja Song Nam attends the United Nations Security Council meeting on North Korea's nuclear program at U.N. headquarters in New York City

North Korea's Ambassador to the UN Ja Song Nam attends the United Nations Security Council meeting on North Korea's nuclear program at U.N. headquarters in New York City, New York, U.S., December 15, 2017. REUTERS/Brendan McDermid TPX IMAGES OF THE DAY

People attend the performance of actor John Travolta at APEX Convention Center in Riyadh

People attend the performance of actor John Travolta at APEX Convention Center in Riyadh, Saudi Arabia December 15, 2017. REUTERS/Faisal al Nasser

Brazil's President Michel Temer speaks during a swearing-in ceremony at the Planalto Palace in Brasilia

Brazil's President Michel Temer speaks during a swearing-in ceremony at the Planalto Palace in Brasilia, Brazil December 15, 2017. REUTERS/Adriano Machado

A lighted sign with the name of the actor John Travolta is seen at APEX Convention Center in Riyadh

A lighted sign with the name of the actor John Travolta is seen at APEX Convention Center in Riyadh, Saudi Arabia December 15, 2017. REUTERS/Faisal al Nasser

Brazil's President Michel Temer gestures during a swearing-in ceremony at the Planalto Palace in Brasilia

Brazil's President Michel Temer gestures during a swearing-in ceremony at the Planalto Palace in Brasilia, Brazil December 15, 2017. REUTERS/Adriano Machado

Euro Hockey Tour - Channel One Cup - Czech Republic v Canada

Ice Hockey - Euro Hockey Tour - Channel One Cup - Czech Republic v Canada - VTB Ice Palace, Moscow, Russia - December 15, 2017. Referees signal the empty net goal scored by Czech Republic's Michal Repik against Canada. REUTERS/Maxim Shemetov

FILE PHOTO: Residents stand near a Mexican marine soldier as he guards an area after a shootout between gang members and the Mexican army in Mexico City

FILE PHOTO: Residents stand near a Mexican marine soldier as he guards an area after a shootout between gang members and the Mexican army in Mexico City, Mexico July 20, 2017. REUTERS/Carlos Jasso/File Photo

Euro Hockey Tour - Channel One Cup - Czech Republic v Canada

Ice Hockey - Euro Hockey Tour - Channel One Cup - Czech Republic v Canada - VTB Ice Palace, Moscow, Russia - December 15, 2017. Czech Republic's players celebrate victory over team Canada. REUTERS/Maxim Shemetov

FILE PHOTO: A demonstrator on a silhouette that represents a victim of violence is painted by an activist during a demonstration demanding justice for the victims of violence and drugs, in Mexico City

FILE PHOTO: A demonstrator on a silhouette that represents a victim of violence is painted by an activist of the organization Nos hacen falta (We are missing them), during a demonstration demanding justice for the victims of violence and drugs, at the Monument to the Revolution in Mexico City, Mexico December 11, 2016. REUTERS/Henry Romero/File Photo

Michel, owner of a private house, installs Christmas decorations in his garden in Bordeaux

Michel, owner of a private house, installs Christmas decorations in his garden in Bordeaux, France, December 15, 2017. REUTERS/Regis Duvignau

Michel, owner of a private house, installs Christmas decorations in his garden in Bordeaux

Michel, owner of a private house, installs Christmas decorations in his garden in Bordeaux, France, December 15, 2017. REUTERS/Regis Duvignau

Michel, owner of a private house, installs Christmas decorations in his garden in Bordeaux

Michel, owner of a private house, installs Christmas decorations in his garden in Bordeaux, France, December 15, 2017. REUTERS/Regis Duvignau

Michel, owner of a private house, installs Christmas decorations in his garden in Bordeaux

Michel, owner of a private house, installs Christmas decorations in his garden in Bordeaux, France, December 15, 2017. REUTERS/Regis Duvignau

A money changer holds U.S. dollar bills at a street in downtown Lima

A money changer holds U.S. dollar bills at a street in downtown Lima, Peru, December 15, 2017. REUTERS/Mariana Bazo

Swedish Foreign Minister Margot Wallstrom speaks during the United Nations Security Council meeting on North Korea's nuclear program at U.N. headquarters in New York

Swedish Foreign Minister Margot Wallstrom speaks during the United Nations Security Council meeting on North Korea's nuclear program at U.N. headquarters in New York City, New York, U.S., December 15, 2017. REUTERS/Brendan McDermid

Japanese Foreign Minister Taro Kono arrives for the United Nations Security Council meeting on North Korea's nuclear program at U.N. headquarters in New York

Japanese Foreign Minister Taro Kono arrives for the United Nations Security Council meeting on North Korea's nuclear program at U.N. headquarters in New York City, New York, U.S., December 15, 2017. REUTERS/Brendan McDermid

Japanese Foreign Minister Taro Kono attends the United Nations Security Council meeting on North Korea's nuclear program at U.N. headquarters in New York

Japanese Foreign Minister Taro Kono attends the United Nations Security Council meeting on North Korea's nuclear program at U.N. headquarters in New York City, New York, U.S., December 15, 2017. REUTERS/Brendan McDermid

U.S. Secretary of State Rex Tillerson delivers remarks to members of the press after a meeting about North Korea's nuclear program at the United Nations headquarters in New York City

U.S. Secretary of State Rex Tillerson delivers remarks to members of the press after a meeting about North Korea's nuclear program at the United Nations headquarters in New York City, U.S. December 15, 2017. REUTERS/Stephanie Keith

U.S. Secretary of State Rex Tillerson delivers remarks to members of the press after a meeting about North Korea's nuclear program at the United Nations headquarters in New York City

U.S. Secretary of State Rex Tillerson delivers remarks to members of the press after a meeting about North Korea's nuclear program at the United Nations headquarters in New York City, U.S. December 15, 2017. REUTERS/Stephanie Keith