(R-L) French President Francois Hollande stands next to French Prime Minister Manuel Valls, French Senate speaker Gerard Larcher, French National Assembly speaker Claude Bartolone, former French President Valery Giscard d'Estaing, Nicolas Sarkozy, head of France's Les Republicains political party and former French president, and Les Republicains political party member Bruno Le Maire during a mass to pay tribute to French priest Father Jacques Hamel at the Notre-Dame Cathedral in Paris, France, July 27, 2016. Father Jacques Hamel was killed on Tuesday in an attack on a church at Saint-Etienne-du-Rouvray near Rouen that was carried out by assailants linked to Islamic State. REUTERS/Benoit Tessier

(R-L) French President Francois Hollande stands next to French Prime Minister Manuel Valls, French Senate speaker Gerard Larcher, French National Assembly speaker Claude Bartolone, former French President Valery Giscard d'Estaing, Nicolas Sarkozy, head of France's Les Republicains political party and former French president, Les Republicains political party member Bruno Le Maire and French Foreign Minister Jean-Marc Ayrault, during a mass to pay tribute to French priest Father Jacques Hamel at the Notre-Dame Cathedral in Paris, France, July 27, 2016. Father Jacques Hamel was killed on Tuesday in an attack on a church at Saint-Etienne-du-Rouvray near Rouen that was carried out by assailants linked to Islamic State. REUTERS/Benoit Tessier

Former French President Valery Giscard d'Estaing (R) speaks with former French prime minister and deputy Francois Fillon before a mass to pay tribute to French priest Father Jacques Hamel at the Notre-Dame Cathedral in Paris, France, July 27, 2016. Father Jacques Hamel was killed on Tuesday in an attack on a church at Saint-Etienne-du-Rouvray near Rouen that was carried out by assailants linked to Islamic State. REUTERS/Benoit Tessier

Former French President Valery Giscard d'Estaing (R) speaks with former French prime minister and deputy Francois Fillon before a mass to pay tribute to French priest Father Jacques Hamel at the Notre-Dame Cathedral in Paris, France, July 27, 2016. Father Jacques Hamel was killed on Tuesday in an attack on a church at Saint-Etienne-du-Rouvray near Rouen that was carried out by assailants linked to Islamic State. REUTERS/Benoit Tessier

Nicolas Sarkozy (C), head of France's Les Republicains political party and former French president, speaks with former French President Valery Giscard d'Estaing (R) as French Les Republicains political party member Bruno Le Maire (L) looks on before a mass to pay tribute to French priest Father Jacques Hamel at the Notre-Dame Cathedral in Paris, France, July 27, 2016. Father Jacques Hamel was killed on Tuesday in an attack on a church at Saint-Etienne-du-Rouvray near Rouen that was carried out by assailants linked to Islamic State. REUTERS/Benoit Tessier

Nicolas Sarkozy (L), head of France's Les Republicains political party and former French president, speaks with former French President Valery Giscard d'Estaing before a mass to pay tribute to French priest Father Jacques Hamel at the Notre-Dame Cathedral in Paris, France, July 27, 2016. Father Jacques Hamel was killed on Tuesday in an attack on a church at Saint-Etienne-du-Rouvray near Rouen that was carried out by assailants linked to Islamic State. REUTERS/Benoit Tessier

Nicolas Sarkozy (L), head of France's Les Republicains political party and former French president, speaks with former French President Valery Giscard d'Estaing before a mass to pay tribute to French priest Father Jacques Hamel at the Notre-Dame Cathedral in Paris, France, July 27, 2016. Father Jacques Hamel was killed on Tuesday in an attack on a church at Saint-Etienne-du-Rouvray near Rouen that was carried out by assailants linked to Islamic State. REUTERS/Benoit Tessier

French President Francois Hollande (C) stands next to (C to L) French Prime Minister Manuel Valls, French Senate speaker Gerard Larcher, French National Assembly speaker Claude Bartolone, former French President Valery Giscard d'Estaing, Nicolas Sarkozy, head of France's Les Republicains political party and former French president, during a mass to pay tribute to French priest Father Jacques Hamel at the Notre-Dame Cathedral in Paris, France, July 27, 2016. Father Jacques Hamel was killed on Tuesday in an attack on a church at Saint-Etienne-du-Rouvray near Rouen that was carried out by assailants linked to Islamic State. REUTERS/Benoit Tessier

French President Francois Hollande (C) stands next to (C to L) French Prime Minister Manuel Valls, French Senate speaker Gerard Larcher, French National Assembly speaker Claude Bartolone, former French President Valery Giscard d'Estaing, Nicolas Sarkozy, head of France's Les Republicains political party and former French president, and French Foreign Minister Jean-Marc Ayrault, during a mass to pay tribute to French priest Father Jacques Hamel at the Notre-Dame Cathedral in Paris, France, July 27, 2016. Father Jacques Hamel was killed on Tuesday in an attack on a church at Saint-Etienne-du-Rouvray near Rouen that was carried out by assailants linked to Islamic State. REUTERS/Benoit Tessier

French President Francois Hollande (C) stands next to (C to L) French Prime Minister Manuel Valls, French Senate speaker Gerard Larcher, French National Assembly speaker Claude Bartolone, former French President Valery Giscard d'Estaing, Nicolas Sarkozy, head of France's Les Republicains political party and former French president, French Foreign Minister Jean-Marc Ayrault, Education Minister Najat Vallaud-Belkacem and Interior Minister Bernard Cazeneuve during a mass to pay tribute to French priest Father Jacques Hamel at the Notre-Dame Cathedral in Paris, France, July 27, 2016. Father Jacques Hamel was killed on Tuesday in an attack on a church at Saint-Etienne-du-Rouvray near Rouen that was carried out by assailants linked to Islamic State. REUTERS/Benoit Tessier

Former EU Convention on the future of Europe and French President Valery Giscard d'Estaing (L) is surrounded by journalists as he attends a news conference in Paris, October 12, 2012. The European Union won the Nobel Peace Prize for its long-term role in uniting the continent, the Norwegian Nobel Committee said on Friday, an award seen as morale boost for the bloc as it struggles to resolve its debt crisis. The committee praised the 27-nation EU for rebuilding after World War Two and for its role in spreading stability to former communist countries after the 1989 fall of the Berlin Wall. REUTERS/Christian Hartmann (FRANCE - Tags: POLITICS MEDIA)

Former EU Convention on the future of Europe and French President Valery Giscard d'Estaing attends a news conference in Paris, October 12, 2012. The European Union won the Nobel Peace Prize for its long-term role in uniting the continent, the Norwegian Nobel Committee said on Friday, an award seen as morale boost for the bloc as it struggles to resolve its debt crisis. The committee praised the 27-nation EU for rebuilding after World War Two and for its role in spreading stability to former communist countries after the 1989 fall of the Berlin Wall. REUTERS/Christian Hartmann (FRANCE - Tags: POLITICS HEADSHOT)

Former EU Convention on the future of Europe and French President Valery Giscard d'Estaing (L) is surrounded by journalists as he attends a news conference in Paris, October 12, 2012. The European Union won the Nobel Peace Prize for its long-term role in uniting the continent, the Norwegian Nobel Committee said on Friday, an award seen as morale boost for the bloc as it struggles to resolve its debt crisis. The committee praised the 27-nation EU for rebuilding after World War Two and for its role in spreading stability to former communist countries after the 1989 fall of the Berlin Wall. REUTERS/Christian Hartmann (FRANCE - Tags: POLITICS MEDIA)

Former EU Convention on the future of Europe and French President Valery Giscard d'Estaing arrives for a news conference in Paris, October 12, 2012. The European Union won the Nobel Peace Prize for its long-term role in uniting the continent, the Norwegian Nobel Committee said on Friday, an award seen as morale boost for the bloc as it struggles to resolve its debt crisis. The committee praised the 27-nation EU for rebuilding after World War Two and for its role in spreading stability to former communist countries after the 1989 fall of the Berlin Wall. REUTERS/Christian Hartmann (FRANCE - Tags: POLITICS)

Former EU Convention on the future of Europe and French President Valery Giscard d'Estaing arrives for a news conference in Paris, October 12, 2012. The European Union won the Nobel Peace Prize for its long-term role in uniting the continent, the Norwegian Nobel Committee said on Friday, an award seen as morale boost for the bloc as it struggles to resolve its debt crisis. The committee praised the 27-nation EU for rebuilding after World War Two and for its role in spreading stability to former communist countries after the 1989 fall of the Berlin Wall. REUTERS/Christian Hartmann (FRANCE - Tags: POLITICS)

Former EU Convention on the future of Europe and French President Valery Giscard d'Estaing arrives for a news conference in Paris, October 12, 2012. The European Union won the Nobel Peace Prize for its long-term role in uniting the continent, the Norwegian Nobel Committee said on Friday, an award seen as morale boost for the bloc as it struggles to resolve its debt crisis. The committee praised the 27-nation EU for rebuilding after World War Two and for its role in spreading stability to former communist countries after the 1989 fall of the Berlin Wall. REUTERS/Christian Hartmann (FRANCE - Tags: POLITICS)

France's former President Valery Giscard d'Estaing (L) listens to Bulgaria's President Georgi Parvanov as they walk in the Presidency building before their meeting in Sofia May 27, 2008. REUTERS/Stoyan Nenov (BULGARIA)

France's UMP political party presidential candidate Nicolas Sarkozy (L) talks with former President Valery Giscard d'Estaing at his home in Chanonat, central France, April 27, 2007. Sarkozy finished first in the opening round of France presidential elections and faces Socialist rival Segolene Royal in a May 6 run-off vote. REUTERS/Elodie Gregoire/Pool (FRANCE)

France's UMP political party presidential candidate Nicolas Sarkozy (L) speaks with former President Valery Giscard d'Estaing at his home in Chanonat, central France, April 27, 2007. Sarkozy finished first in the opening round of France presidential elections and faces Socialist rival Segolene Royal in a May 6 run-off vote. REUTERS/Elodie Gregoire/Pool (FRANCE)

France's UMP political party presidential candidate Nicolas Sarkozy (L) speaks with former President Valery Giscard d'Estaing at his home in Chanonat, central France, April 27, 2007. Sarkozy finished first in the opening round of France presidential elections and faces Socialist rival Segolene Royal in a May 6 run-off vote. REUTERS/Elodie Gregoire/Pool (FRANCE)

France's UMP political party presidential candidate Nicolas Sarkozy (L) is offered lilies of the valley by former France's President Valery Giscard d'Estaing at his home in Chanonat, central France, April 27, 2007. Sarkozy finished first in the opening round of France presidential elections and faces Socialist rival Segolene Royal in a May 6 run-off vote. REUTERS/Elodie Gregoire/Pool (FRANCE)

France's UMP political party presidential candidate Nicolas Sarkozy walks ahead of former President Valery Giscard d'Estaing at his home in Chanonat, central France, April 27, 2007. Sarkozy finished first in the first round of France presidential elections and faces Socialist rival Segolene Royal in a May 6 run-off vote. REUTERS/Dominiue Faget/Pool (FRANCE)

France's UMP political party presidential candidate Nicolas Sarkozy (L) walks with former President Valery Giscard d'Estaing at his home in Chanonat, central France, April 27, 2007. Sarkozy finished first in the first round of France presidential elections and faces Socialist rival Segolene Royal in a May 6 run-off vote. REUTERS/Dominiue Faget/Pool (FRANCE)

France's UMP political party presidential candidate Nicolas Sarkozy (L) speaks with former President Valery Giscard d'Estaing at his home in Chanonat, central France, April 27, 2007. Sarkozy finished first in the first round of France presidential elections and faces Socialist rival Segolene Royal in a May 6 run-off vote. REUTERS/Dominiue Faget/Pool (FRANCE)

France's UMP political party presidential candidate Nicolas Sarkozy (L) speaks with former France's President Valery Giscard d'Estaing at his home in Chanonat, central France, April 27, 2007. Sarkozy finished first in the first round of France presidential elections and faces Socialist rival Segolene Royal in a May 6 run-off vote. REUTERS/Dominiue Faget/Pool (FRANCE)

European Convention President Valery Giscard d'Estaing smiles before delivering a speech during a plenary session of the Convention on the Future of Europe at the European Parliament in Brussels February 27, 2003. [Fired up by Pope John Paul, God's supporters fought on Thursday to insert Europe's Christian heritage into a draft constitution for an enlarged European Union against strong secularist opposition.]

European Convention President Valery Giscard d'Estaing makes a speech
during a plenary session of the Convention on the Future of Europe at
the European Parliament in Brussels February 27, 2003. Fired up by Pope
John Paul, God's supporters fought on Thursday to insert Europe's
Christian heritage into a draft constitution for an enlarged European
Union against strong secularist opposition.

REUTERS/Francois Lenoir

European Convention President Valery Giscard d'Estaing smiles before
delivering a speech during a plenary session of the Convention on the
Future of Europe at the European Parliament in Brussels February 27,
2003. Fired up by Pope John Paul, God's supporters fought on Thursday
to insert Europe's Christian heritage into a draft constitution for an
enlarged European Union against strong secularist opposition.

REUTERS/Francois Lenoir