| Mr Fillon's poll ratings have been hit by allegations surrounding payments to family members |
French centre-right presidential
candidate Francois Fillon has said he will fight on, as he announced
that a judge was placing him under formal investigation.
"It's a political assassination," Mr Fillon told reporters on Wednesday.
He has now been summoned to appear before the judge, Serge Tournaire, on 15 March. The date is just two days before the deadline for candidates to submit their final applications. The first round takes place on 23 April, followed by a second-round run-off on 7 May.