A combination picture shows (L-R) U.S. President Donald Trump preparing himself before a family photo at the G20 summit in Hamburg, Germany, July 7, 2017, President Donald Trump, First Lady Melania Trump, French President Emmanuel Macron and his wife Brigitte Macron looking to flypasts in the Normandy American Cemetery to commemorate the 75th anniversary of the D-Day landings, Normandy, France, June 6, 2019, President Trump inspecting an honour guard during a welcome ceremony in Buckingham Palace, in London, Britain, June 3, 2019, and President Trump delivering remarks on North Korea accompanied by Japanese Prime Minister Shinzo Abe at Mar-a-Lago club in Palm Beach, Florida U.S., February 11, 2017. REUTERS/Carlos Barria SEARCH "BARRIA POSTCARDS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

U.S. President Donald Trump shakes hands with French President Emmanuel Macron during a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS TPX IMAGES OF THE DAY 

D-Day veteran and former POW Robert Levine, 94, of Teaneck, NJ, holds up a newspaper front page during the 75th anniversary of the D-Day landings in Normandy at the World War II Memorial in Washington, U.S., June 6, 2019. REUTERS/Kevin Lamarque 

U.S President Donald Trump, First Lady Melania Trump, French President Emmanuel Macron and his wife Brigitte Macron look to flypasts in the Normandy American Cemetery to commemorate the 75th anniversary of the D-Day landings, Normandy, France, June 6, 2019. REUTERS/Carlos Barria TPX IMAGES OF THE DAY 

A World War II veteran is seen behind a wreath during the anniversary of the D-Day landings in Normandy at the World War II Memorial in Washington, U.S., June 6, 2019. REUTERS/Kevin Lamarque 

World War II Normandy campaign veterans arrive to take part in a commemoration of the 75th anniversary of the D-Day landings at the World War II Memorial in Washington, U.S., June 6, 2019. REUTERS/Kevin Lamarque 

World War II Normandy campaign veterans arrive to take part in a commemoration of the 75th anniversary of the D-Day landings at the World War II Memorial in Washington, U.S., June 6, 2019. REUTERS/Kevin Lamarque 

A World War II Normandy veterans places his hat over his heart during a commemoration of the 75th anniversary of the D-Day landings at the World War II Memorial in Washington, U.S., June 6, 2019. REUTERS/Kevin Lamarque 

World War II Normandy campaign veterans are protected from the sun during a commemoration of the 75th anniversary of the D-Day landings at the World War II Memorial in Washington, U.S., June 6, 2019. REUTERS/Kevin Lamarque 

French President Emmanuel Macron and former member of French Captain Philippe Kieffer's green berets commando Leon Gautier, 96 years old, attend a ceremony in memory of marines and the famed Kieffer commandos who took part to D-Day landings, in Colleville-Montgomery, as part of the 75th anniversary of the D-Day, France, June 6, 2019. REUTERS/Christian Hartmann 

French President Emmanuel Macron and former member of French Captain Philippe Kieffer's green berets commando Leon Gautier, 96 years old, attend a ceremony in memory of marines and the famed Kieffer commandos who took part to D-Day landings, in Colleville-Montgomery, as part of the 75th anniversary of the D-Day, France, June 6, 2019. REUTERS/Christian Hartmann 

French President Emmanuel Macron attends a ceremony in memory of marines and the famed Kieffer's green berets commandos who took part to D-Day landings, in Colleville-Montgomery, as part of the 75th anniversary of the D-Day, France, June 6, 2019. REUTERS/Christian Hartmann 

Former member of French Captain Philippe Kieffer's green berets commando Leon Gautier, 96 years old, attends a ceremony in memory of marines and the famed Kieffer commandos who took part to D-Day landings, in Colleville-Montgomery, as part of the 75th anniversary of the D-Day, France, June 6, 2019. REUTERS/Christian Hartmann 

French President Emmanuel Macron attends a ceremony in memory of marines and the famed Kieffer's green berets commandos who took part to D-Day landings, in Colleville-Montgomery, as part of the 75th anniversary of the D-Day, France, June 6, 2019. REUTERS/Christian Hartmann 

Former member of French Captain Philippe Kieffer's green berets commando Leon Gautier, 96 years old, attends a ceremony in memory of marines and the famed Kieffer commandos who took part to D-Day landings, in Colleville-Montgomery, as part of the 75th anniversary of the D-Day, France, June 6, 2019. REUTERS/Christian Hartmann 

French President Emmanuel Macron and former member of French Captain Philippe Kieffer's green berets commando Leon Gautier, 96 years old, attend a ceremony in memory of marines and the famed Kieffer commandos who took part to D-Day landings, in Colleville-Montgomery, as part of the 75th anniversary of the D-Day, France, June 6, 2019. REUTERS/Christian Hartmann 

French President Emmanuel Macron and former member of French Captain Philippe Kieffer's green berets commando Leon Gautier, 96 years old, attend a ceremony in memory of marines and the famed Kieffer commandos who took part to D-Day landings, in Colleville-Montgomery, as part of the 75th anniversary of the D-Day, France, June 6, 2019. REUTERS/Christian Hartmann 

History enthusiasts drive a vintage jeep during a re-enactment of D-Day landings during commemoration of the 75th anniversary of the D-Day, in Colleville-Montgomery, on the Normandy coast, France, June 6, 2019. REUTERS/Pascal Rossignol 

History enthusiasts drive a vintage jeep during a re-enactment of D-Day landings during commemoration of the 75th anniversary of the D-Day, in Colleville-Montgomery, Normandy coast, France, June 6, 2019. REUTERS/Pascal Rossignol 

French President Emmanuel Macron arrives to attend a ceremony in memory of marines and the famed Kieffer's green berets commandos who took part to D-Day landings, in Colleville-Montgomery as part of the 75th anniversary of the D-Day, France, June 6, 2019. REUTERS/Christian Hartmann 

French President Emmanuel Macron arrives to attend a ceremony in memory of marines and the famed Kieffer's green berets commandos who took part to D-Day landings, in Colleville-Montgomery as part of the 75th anniversary of the D-Day, France, June 6, 2019. REUTERS/Christian Hartmann 

Officers from The French Republican Guard prepare for the arrival of French President Emmanuel Macron and U.S. President Donald Trump ahead of a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

French President Emmanuel Macron speaks with U.S. President Donald Trump ahead of a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

French President Emmanuel Macron speaks with U.S. President Donald Trump ahead of a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

French President Emmanuel Macron speaks with U.S. President Donald Trump ahead of a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

French President Emmanuel Macron speaks with U.S. President Donald Trump ahead of a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

French President Emmanuel Macron looks on during a meeting with U.S. President Donald Trump (not pictured) at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump shakes hands with French President Emmanuel Macron during a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump shakes hands with French President Emmanuel Macron during a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump looks on during a meeting with French President Emmanuel Macron (not pictured) at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump looks on during a meeting with French President Emmanuel Macron (not pictured) at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump gestures during a meeting with French President Emmanuel Macron (not pictured) at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump gestures during a meeting with French President Emmanuel Macron (not pictured) at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump gestures during a meeting with French President Emmanuel Macron (not pictured) at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump looks on during a meeting with French President Emmanuel Macron (not pictured) at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump looks on during a meeting with French President Emmanuel Macron (not pictured) at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump gestures during a meeting with French President Emmanuel Macron (not pictured) at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump and French President Emmanuel Macron shake hands during a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump and French President Emmanuel Macron meet at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump and French President Emmanuel Macron shake hands during a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump and French President Emmanuel Macron shake hands during a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump and French President Emmanuel Macron shake hands during a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump and French President Emmanuel Macron shake hands during a meeting at the Prefecture of Caen, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy, France, June 6, 2019. Ludovic Marin/Pool via REUTERS 

French President Emmanuel Macron (C/R) and U.S. President Donald Trump (C/L) pose with officials ahead of a lunch meeting at the Prefecture of Caen, Normandy, France June 6, 2019, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy. Ludovic Marin/Pool via REUTERS 

General view of the French-USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France June 6, 2019. Ian Langsdon/Pool via REUTERS 

US President Donald Trump (L) and US First Lady Melania Trump (R) attend the French - USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France, 06 June 2019. World leaders are attending memorial events in Normandy, France to mark the 75th anniversary of the D-Day landings, which marked the beginning of the end of World War II in Europe. Ian Langsdon/Pool via REUTERS 

US First Lady Melania Trump (L) and Brigitte Macron (R) attend the French - USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France, 06 June 2019. World leaders are attending memorial events on 06 June in Normandy, France to mark the 75th anniversary of the D-Day landings, which marked the beginning of the end of World War II in Europe. Ian Langsdon/Pool via REUTERS 

US President Donald Trump (L) and US First Lady Melania Trump (R) attend the French - USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France, 06 June 2019. World leaders are attending memorial events in Normandy, France to mark the 75th anniversary of the D-Day landings, which marked the beginning of the end of World War II in Europe. Ian Langsdon/Pool via REUTERS 

US national security advisor John Bolton attending the French - USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France, 06 June 2019. World leaders are attending memorial events in Normandy, France to mark the 75th anniversary of the D-Day landings, which marked the beginning of the end of World War II in Europe. Ian Langsdon/Pool via REUTERS 

US President Donald Trump (R) and French President Emmanuel Macron (L) attend the French - USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France, 06 June 2019. World leaders are attending memorial events on 06 June in Normandy, France to mark the 75th anniversary of the D-Day landings, which marked the beginning of the end of World War II in Europe. Ian Langsdon/Pool via REUTERS 

US First Lady Melania Trump (L) and Brigitte Macron (R) attend the French - USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France, 06 June 2019. World leaders are attending memorial events on 06 June in Normandy, France to mark the 75th anniversary of the D-Day landings, which marked the beginning of the end of World War II in Europe. Ian Langsdon/Pool via REUTERS 

US President Donald Trump (R) and French President Emmanuel Macron (L) attend the French - USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France, 06 June 2019. World leaders are attending memorial events on 06 June in Normandy, France to mark the 75th anniversary of the D-Day landings, which marked the beginning of the end of World War II in Europe. Ian Langsdon/Pool via REUTERS 

U.S. President Donald Trump (C-L), U.S. First Lady Melania Trump (L), French President Emmanuel Macron (C-R) and his wife Brigitte Macron (R) react during the French-USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France June 6, 2019. Ian Langsdon/Pool via REUTERS 

U.S. President Donald Trump and U.S. First Lady Melania Trump attend the French-USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France June 6, 2019. Ian Langsdon/Pool via REUTERS 

U.S. President Donald Trump and French President Emmanuel Macron react during the French-USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France June 6, 2019. Ian Langsdon/Pool via REUTERS 

U.S. President Donald Trump and French President Emmanuel Macron react during the French-USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France June 6, 2019. Ian Langsdon/Pool via REUTERS 

U.S. President Donald Trump and French President Emmanuel Macron speak during a meeting at the Prefecture of Caen, Normandy, France June 6, 2019, on the sidelines of D-Day commemorations marking the 75th anniversary of the World War II Allied landings in Normandy. Ludovic Marin/Pool via REUTERS 

U.S. President Donald Trump (C-L), U.S. First Lady Melania Trump (L), French President Emmanuel Macron (C-R) and his wife Brigitte Macron (R) react during the French-USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France June 6, 2019. Ian Langsdon/Pool via REUTERS 

U.S. President Donald Trump (C-L), U.S. First Lady Melania Trump (L), French President Emmanuel Macron (C-R) and his wife Brigitte Macron (R) react during the French-USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France June 6, 2019. Ian Langsdon/Pool via REUTERS 

U.S. President Donald Trump and French President Emmanuel Macron react during the French-USA Commemoration marking the 75th anniversary of the Allied landings on D-Day at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, France June 6, 2019. Ian Langsdon/Pool via REUTERS