(LtoR) Former French Economy Minister and candidate for the left-wing primary ahead of the 2017 presidential election Arnaud Montebourg shakes hands with French dissident Socialist MP Christian Paul next to French Socialist Party (PS) member and primary candidate Benoit Hamon during the summer conference of the French dissident Socialist MPs known as "Les Frondeurs" (The Insubordinates) on September 11, 2016 in La Rochelle, southwestern France. / AFP PHOTO / XAVIER LEOTYXAVIER LEOTY/AFP/Getty Images