France remains on high alert after a wave of attacks commissioned or inspired by Islamic State militants since early 2015, in which about 240 people have been killed.
During a three-day killing spree in January 2015, gunmen killed reporters and illustrators at satirical weekly Charlie Hebdo, police officers and shoppers at a Jewish supermarket.
Abdelkadar Merah is accused of helping his younger brother, Mohammed, kill four Jews and three soldiers in 2012.
Some of the candidates later clashed over whether official campaigning, which has just one more day to run, should be brought to a full stop in light of the attack.
France's move against burkinis follows a series of deadly attacks by Islamist militants that has put the nation on edge.
Rubio, 26, was visiting the French Riviera city on his way back to the US from Israel when the brutal attack that killed up to 84 people occurred.
Following the massacre, Army Radio reported that no Israelis were harmed in the tragedy. They added, however, that five members of the Jewish community in Nice had been injured in the attack.
Sharansky calls for mass aliya from France.
Tensions remain high in France, still recovering from the November 2015 attacks in Paris, which included three explosions near the Stade de France national sports stadium.
French authorities allege that Diab was a member of the Popular Front for the Liberation of Palestine and took part in the synagogue bombing.