French centrist presidential candidate Emmanuel Macron (R) shakes hands with Etienne Cardiles, the partner of the policeman killed by a jihadist in an attack on the Champs Elysees, on April 25, 2017, during a ceremony at the Paris prefecture building.
French police officer Xavier Jugele was killed on the world-famous Paris avenue on April 20, in an attack claimed by the Islamic State group. / AFP PHOTO / STRINGER        (Photo credit should read STRINGER/AFP/Getty Images)