French authorities are investigating allegations that conservative presidential candidate Francois Fillon hired his wife for what was essentially a sham position.He is accused of putting his wife, Penelope, on his parliamentary office payroll and paying her about $900,000 of taxpayer money over a 15-year period, according to the satirical newspaper Le Canard Enchaine. Fillon also reportedly hired two of his children.Hiring one's spouse is not illegal, reports NPR's Eleanor Beardsley, but "there's little evidence she actually worked.""The growing scandal is damning for a candidate whose greatest asset was his integrity and Catholic family man image," Eleanor says. She adds that Fillon has denounced the allegations and is asking fellow conservatives to stay loyal to him.The Guardian reported Tuesday that French police had searched the lower house of parliament and that Fillon and his wife were questioned separately for five hours on Monday by anti-corruption officers in connection with the allegation.Fillon's support among French voters has faltered, based on a poll conducted Sunday and Monday, according to Reuters, which could hurt him in the rounds of voting in April and May, where he has been widely expected to face either far-right nationalist candidate Marine Le Pen or centrist Emmanuel Macron.The same poll found support for Le Pen had grown, despite separate allegations of misconduct.Le Pen has been asked to pay back more than $320,000 to the European Parliament because two of her aides in Brussels were actually working for her campaign in France. She has denied any wrongdoing.Le Pen is a serious contender for the presidency, as NPR's Eleanor Beardsley reported in a story last week about the candidate and her National Front party platform: