French PM Valls keeps open option of challenge to Hollande

By Jean-Baptiste Vey PARIS (Reuters) - French Prime Minister Manuel Valls on Sunday kept open the possibility he could challenge his boss Francois Hollande as the Socialists' candidate in the 2017 presidential election, risking a further splintering of an already fractured left. In past weeks, the message from the Valls' camp has been that he would wait for President Hollande's decision on whether to seek a second term, and would make a presidential bid of his own only if Hollande decided to ste