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French Socialist Party presidential candidate, Benoit Hamon, speaks during a press conference following the inauguration of his campaign headquarters on February 11, 2017 in Paris. In the background, Hamon's campaign's slogan reads in French: 'Make the heart of France beat' (Faire battre le coeur de la France). / AFP / PHILIPPE LOPEZ (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)

French Socialist Party presidential candidate, Benoit Hamon, speaks during a press conference following the inauguration of his campaign headquarters on February 11, 2017 in Paris. In the background, Hamon's campaign's slogan reads in French: 'Make the heart of France beat' (Faire battre le coeur de la France).  / AFP / PHILIPPE LOPEZ        (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)

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Candidate for France's left-wing primaries ahead of the 2017 Presidential election Arnaud Montebourg speaks during a meeting with members of the 'Movement of the Young Socialists', the youth organisation of the French Socialist Party on January 14, 2017 in Paris. / AFP / BERTRAND GUAY (Photo credit should read BERTRAND GUAY/AFP/Getty Images)

Candidate for France's left-wing primaries ahead of the 2017 Presidential election Arnaud Montebourg speaks during a meeting with members of the 'Movement of the Young Socialists', the youth organisation of the French Socialist Party on January 14, 2017 in Paris. / AFP / BERTRAND GUAY        (Photo credit should read BERTRAND GUAY/AFP/Getty Images)

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Candidate for France's left-wing primaries ahead of the 2017 Presidential election Arnaud Montebourg speaks during a meeting with members of the 'Movement of the Young Socialists', the youth organisation of the French Socialist Party on January 14, 2017 in Paris. / AFP / BERTRAND GUAY (Photo credit should read BERTRAND GUAY/AFP/Getty Images)

Candidate for France's left-wing primaries ahead of the 2017 Presidential election Arnaud Montebourg speaks during a meeting with members of the 'Movement of the Young Socialists', the youth organisation of the French Socialist Party on January 14, 2017 in Paris. / AFP / BERTRAND GUAY        (Photo credit should read BERTRAND GUAY/AFP/Getty Images)

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French Socialist Party presidential candidate Benoit Hamon gestures as he delivers a speech, in Gueret, Central France, on February 9, 2017. / AFP / PASCAL LACHENAUD (Photo credit should read PASCAL LACHENAUD/AFP/Getty Images)

French Socialist Party presidential candidate Benoit Hamon gestures as he delivers a speech, in Gueret, Central France, on February 9, 2017. / AFP / PASCAL LACHENAUD        (Photo credit should read PASCAL LACHENAUD/AFP/Getty Images)