PARIS -- French conservative presidential candidate Francois Fillon has denied that he acted illegally in a scandal surrounding his wife's well-paid job as his assistant.

Fillon told a news conference that "all acts evoked (in the press) are legal and transparent."

The candidate said "I have nothing to hide" and the accusations are "unfounded."

Fillon was once considered the front-runner in France's two-round April-May presidential vote. Prosecutors are investigating the well-paid political jobs he gave to his wife, son and daughter to see if they actually did any work.