The Opinionway poll, published on its website shortly before 11:00 GMT, showed Le Pen scoring 25% in a first-round vote set for April 23, with independent Emmanuel Macron on 22% and conservative Francois Fillon on 20% - scores that would put Macron into the runoff against Le Pen, according to Reuters.

Read alsoRussian media leap on French presidential candidate with rumors and innuendo - WPMacron would beat Le Pen 66% to 34% in the two-way runoff. Fillon, were he to make it instead of Macron, would beat Le Pen with a score of 62% versus her 38%.