Probe into France's Fillon widens

French conservative presidential candidate Francois Fillon's legal problems deepened on Tuesday, with financial prosecutors expanding a probe into payments to his family to suspected "aggravated fraud, forgery and use of forgeries", a judicial source said. Investigators are probing whether Fillon and his wife Penelope forged documents to try to justify around 700,000 euros ($757,000) she earned for a suspected fake job as a parliamentary assistant, the source said. The news came as Socialist Interior Minister Bruno Le Roux resigned after revelations that he had hired his two teenage daughters as parliamentary aides, prompting comparisons to Fillon's scandal. France goes to the polls next month for the first round of a two-stage election to pick the next president. It has been a rollercoaster campaign, with a string of revelations that have knocked Fillon from the top of the opinion polls. His wife Penelope and two of the couple's children are suspected of holding fake jobs as parliamentary aides for which they were paid around 900,000 euros in total. - 'Political assassination' - The conservative presidential candidate denies any wrongdoing, claiming to be the victim of an attempted "political assassination" and questioning the justice system's impartiality. The widened probe includes documents signed by Penelope Fillon bearing differing calculations of hours worked, the daily Le Monde reported. Investigators are looking into whether "the calculations constitute forgeries made to justify, after the fact, the wages that were paid," it said. Penelope Fillon's lawyer Pierre Cornut-Gentille firmly denied any attempt at forgery and denounced what he called a violation of confidentiality during the ongoing investigation. French lawmakers are allowed to hire family members as assistants, as long as they do real work. The expenses scandal, and later revelations about lavish gifts from wealthy friends, have bolstered the widespread belief that France's political class is self-serving and out of touch with the citizenry. Far-right leader Marine Le Pen and centrist Emmanuel Macron are the two leading candidates in the election, according to opinion polls, with the first round due on April 23 and the run-off vote on May 7. - Putin meeting - Fillon sought to shift the focus from his legal woes to his cost-cutting platform in a debate on Monday among the top five presidential candidates. But on Tuesday he was hit by potentially even more embarrassing revelations. The Canard Enchaine newspaper reported that Fillon introduced a Lebanese oil pipeline builder -- with whom he signed a $50,000 lobbying contract -- to Russian President Vladimir Putin at a business forum in St. Petersburg in 2015. "The suspicions of conflict of interest are totally unfounded," Fillon's campaign team told AFP, insisting he had never taken money from Putin or a Russian company. With one month to go before the first round of elections for a successor to the deeply unpopular Socialist President Francois Hollande -- who is not seeking re-election -- the electorate is particularly disillusioned. Only 17 percent of those questioned in an Ipsos poll last month gave high marks to France's democratic system. Le Roux, who resigned Tuesday, also denied wrongdoing but said he did not want the investigation into the contracts -- for which his daughters earned a total of 55,000 euros as parliamentary aides -- to "undermine the work of the government". Le Roux, 51, had been in the Socialist government just 106 days, having taken over the weighty interior portfolio when Bernard Cazeneuve was elevated to prime minister. Junior minister for trade, Matthias Fekl, 39, has been named as Le Roux's replacement. The TMC channel reported late Monday that Le Roux's daughters were still in school when he first hired them, and they continued doing work for him -- paid with taxpayers' money -- when they were at university. Le Roux told TMC that his daughters had worked for him during their summer holidays. He has been placed under preliminary investigation. The writing was on the wall for Le Roux when Cazeneuve, without naming him, said earlier Tuesday that government officials must be "irreproachable". "Otherwise the authority of the state is weakened," Cazeneuve said at a Paris event.