The raid late Thursday at La Revue des Deux Mondes follows the launch of the investigation into Penelope Fillon's role at the literary monthly, owned by a billionaire friend of her husband, as well as in the French parliament, where she was paid USD 534,000 from public funds over more than a decade.
The satirical weekly Le Canard Enchaine, which broke the story, said the Welsh-born Penelope Fillon had done nothing to earn her salary at the legislature, since it had been unable to find anyone who remembered her working there.
In a separate development, a French watchdog for political ethics said today it had handed investigators Fillon's declaration of wealth and business interests.
The High Authority for Transparency in Public Office (HATVP) confirmed a report on the radio station Europe 1, saying it handed over the information in response to a judicial request.
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The HATVP was set up in 2013 with the aim of improving transparency and accountability in French politics after a string of high-profile scandals. It is the repository of legislators' declarations and issues rulings on conflicts of interest.
An opinion poll yesterday found that 38 per cent of voters across the political spectrum had a "good opinion" of the former prime minister.
That was a drop of four points from a poll on January 8, and 16 points less than in early November, according to the Odoxa survey of 1,012 people.
Fillon said in a TV interview Thursday that he was "disgusted" at the allegations that his wife had done nothing to earn half a million euros from public funds.
La Revue des Deux Mondes ("The Review of the Two Worlds") traces its roots to the French literary scene of the early 19th century.
Contributors have included giants such as George Sand, Alexandre Dumas and Alphonse de Musset.
The magazine today is focussed on politics and literary and, coincidentally, devoted its front page this month to Fillon.