Demonstrators march with posters reading "No to Le Pen" during the May Day demonstration, Monday May 1, 2017, in Paris. With just six days until a French presidential vote that could define Europe's future, far-right leader Marine Le Pen and centrist Emmanuel Macron held high-stakes rallies that overlapped with May Day workers' rights marches, reminding both candidates that jobs are voters' No. 1 concern. (AP Photo/Thibault Camus)