Inside the NATO summit

U.S. President Donald Trump talks with Canada's Prime Minister Justin Trudeau during plenary session at the NATO summit in Watford, Britain, December 4, 2019. Trump called Trudeau "two-faced" on Wednesday over comments the Canadian prime minister...more

Princess Royal Anne talks to NATO Secretary General Jens Stoltenberg, Canadian Prime Minister Justin Trudeau, French President Emmanuel Macron and Britain's Prime Minister Boris Johnson, during a reception to mark 70 years of the NATO Alliance,...more

Canadian Prime Minister Justin Trudeau speaks with French President Emmanuel Macron, British Prime Minister Boris Johnson and Dutch Prime Minister Mark Rutte ahead of the NATO summit, at a reception at Buckingham Palace in London, Britain December 3,...more

Canadian Prime Minister Justin Trudeau, French President Emmanuel Macron, British Prime Minister Boris Johnson and Dutch Prime Minister Mark Rutte chat ahead of the NATO summit, at a reception at Buckingham Palace in London, Britain December 3, 2019....more

Princess Royal Anne talks to Canadian Prime Minister Justin Trudeau and Britain's Prime Minister Boris Johnson, during a reception to mark 70 years of the NATO Alliance, hosted by Queen Elizabeth, in London, December 3, 2019. Yui Mok/Pool via REUTERS

U.S. President Donald Trump stands among other leaders as he attends a NATO plenary session, December 4, 2019. REUTERS/Kevin Lamarque

Donald Trump meets with France's President Emmanuel Macron in London, December 3, 2019. Ludovic Marin/Pool via REUTERS

President Donald Trump, Secretary of State Mike Pompeo and Acting White House Chief of Staff Mick Mulvaney attend a plenary session at the NATO summit in Watford, December 4, 2019. REUTERS/Kevin Lamarque

NATO Secretary General Jens Stoltenberg gestures next to President Donald Trump during a welcoming ceremony at the NATO leaders summit, December 4, 2019. REUTERS/Christian Hartmann/Pool

France's President Emmanuel Macron and Germany's Chancellor Angela Merkel look on as U.S. President Donald Trump and Turkey's President Recep Tayyip Erdogan walk during a photo opportunity at the NATO leaders summit, December 4, 2019....more

U.S. President Donald Trump, Turkey's President Tayyip Erdogan and Germany's Chancellor Angela Merkel attend a family photo opportunity, December 4, 2019. REUTERS/Christian Hartmann/Pool

U.S. President Donald Trump reacts next to NATO Secretary General Jens Stoltenberg as they attend a working lunch, December 4, 2019. REUTERS/Kevin Lamarque

NATO Secretary General Jens Stoltenberg and Britain's Prime Minister Boris Johnson attend a welcoming ceremony, December 4, 2019. REUTERS/Yves Herman

Britain's Prime Minister Boris Johnson welcomes U.S. President Donald Trump at the NATO leaders summit, December 4, 2019. REUTERS/Yves Herman

Canada's Prime Minister Justin Trudeau holds a news conference at the end of the NATO leaders summit, December 4, 2019. REUTERS/Henry Nicholls

Canada's Prime Minister Justin Trudeau speaks during a news conference at the end of the NATO leaders summit, December 4, 2019. REUTERS/Henry Nicholls

NATO Secretary General Jens Stoltenberg, join Britain's Queen Elizabeth, Prince Charles, Prime Minister Boris Johnson, President Donald Trump, German Chancellor Angela Merkel, French President Emmanuel Macron and Canadian Prime Minister Justin...more

Emmanuel Macron, Boris Johnson, Tayyip Erdogan and Angela Merkel pose as they meet at Downing Street ahead of the NATO summit in London, December 3, 2019. Murat Cetinmuhurdar/Presidential Press Office/Handout via REUTERS

Camilla, Duchess of Cornwall and Prime Minister Justin Trudeau talk during a reception to mark 70 years of the NATO Alliance, hosted by Queen Elizabeth, at Buckingham Palace, December 3, 2019. Yui Mok/Pool via REUTERS

Tayyip Erdogan waves outside 10 Downing Street ahead of the NATO summit in London, December 3, 2019. Daniel Leal-Olivas/Pool via REUTERS

First lady Melania Trump and German Chancellor Angela Merkel are seen during a reception at Buckingham Palace to mark 70 years of the NATO Alliance, hosted by Queen Elizabeth, in London, December 3, 2019. Geoff Pugh/Pool via REUTERS

Luxembourg's Prime Minister Xavier Bettel and his husband Gauthier Destenay arrive for a reception at Downing Street ahead of the NATO summit, in London, December 3, 2019. Alastair Grant/Pool via REUTERS

Catherine, Duchess of Cambridge attends a reception to mark 70 years of the NATO Alliance, hosted by Queen Elizabeth at Buckingham Palace, in London, December 3, 2019. Yui Mok/Pool via REUTERS

U.S. President Donald Trump and first lady Melania Trump arrive for a reception at Downing Street, ahead of the NATO summit, in London, December 3, 2019. REUTERS/Hannah McKay

Iceland's Prime Minister Katrin Jakobsdottir leaves Downing Street after attending a reception in Watford, in London, December 3, 2019. Alastair Grant/Pool via REUTERS

Croatian Prime Minister Andrej Plenkovic leaves Downing Street after attending a reception in Watford, in London, December 3, 2019. Alastair Grant/Pool via REUTERS

Donald Trump and Melania Trump arrive at Clarence House to meet Prince Charles and Camilla ahead of the NATO alliance summit, in London, December 3, 2019. Nicholas Kamm/Pool via REUTERS

Dutch Prime Minister Mark Rutte arrives for a reception in Downing Street, ahead of the NATO summit in Watford, in London, December 3, 2019. REUTERS/Peter Nicholls

Donald Trump and Melania Trump are seen together with Prince Charles and Camilla, Duchess of Cornwall during a reception at Buckingham Palace hosted by Queen Elizabeth, in London, December 3, 2019. Geoff Pugh/Pool via REUTERS

Norway's Prime Minister Erna Solberg and her husband Sindre Finnes are greeted by Deputy Master of The Household Lt Col Anthony Charles Richards as they arrive at Buckingham Palace for a reception in London, December 3, 2019. Dan Kitwood/Pool via...more

Queen Elizabeth walks with Melania Trump during a reception to mark 70 years of the NATO Alliance in London, December 3, 2019. Yui Mok/Pool via REUTERS

Czech President Milos Zeman arrives at Buckingham Palace for a reception to mark 70 years of the NATO Alliance in London, December 3, 2019. Dan Kitwood/Pool via REUTERS

Poland's President Andrzej Duda and his wife Agata arrive for a reception at Downing Street in London, December 3, 2019. Alastair Grant/Pool via REUTERS

Melania Trump joins local school students and U.S. Marines stationed at the U.S. Embassy, wrapping holiday presents to be donated to the Salvation Army, at the Salvation Army Clapton Center in London, December 4, 2019. Alastair Grant/Pool via REUTERS