Le Pen in the runoff next month.
According to a poll by Harris Interactive, only 12% of Mélenchon voters would switch to Ms.
Le Pen in the second round.
Le Pen is more likely to pick François Fillon's voters, of whom 23% would switch to the National Front leader in the second round, the poll shows.
Mélenchon instead accused both centrist candidate Emmanuel Macron and far-right standard bearer Marine Le Pen of failing to address a corrupt status quo and said that he would ask his supporters to vote on his website to determine whom his movement would support during the May 7 runoff.