Francois Fillon, the conservative candidate in France's presidential election, will face a probe by investigating magistrates into claims he gave members of his family fake jobs, prosecutors said, according to AFP.
Fillon, one of the frontrunners in the presidential race, will be investigated for alleged embezzlement of public funds and misappropriation of corporate assets, prosecutors said in a statement.
The 62-year-old former prime minister has not been charged at this point, but under French law investigating magistrates can decide to bring charges.
With the first round of the election just two months away, on April 23, the timing of the decision could have a crucial bearing on the race.
Far-right National Front leader Marine Le Pen has been bolstered by the scandal and was leading in polls Friday, February 24.
Fillon has been fighting claims first made a month ago by Le Canard Enchaine newspaper that he used allowances to pay his British-born wife Penelope at least 680,000 euros ($720,000) over some 15 years as a parliamentary aide.
She is accused of having barely worked for the salary. Two of Fillon's children were also put on the parliamentary payroll for brief periods.
The Canard Enchaine also alleged that Penelope Fillon was also paid tens of thousands of euros by a literary review, the Revue des Deux Mondes, owned by billionaire Marc Ladreit de Lacharriere, a friend of her husband.
Magistrates will investigate whether this amounts to misappropriation of corporate assets.
Prosecutors said the three investigating magistrates named to handle the case will also look at whether Fillon failed to declare the necessary information to parliamentary authorities.
Lawyers for the couple said they were confident the magistrates would find them innocent.
The Fillons have argued that Penelope was legitimately employed as a parliamentary aide and their lawyers say they have given investigators proof of the work she did.
But after the allegations emerged, French TV broadcast an interview that Penelope gave to a British journalist in 2007 in which she said she had never been her husband's assistant.