PARIS — With the Eiffel Tower as a backdrop, French conservative Francois Fillon clung tenaciously to his presidential candidacy Sunday, urging tens of thousands of supporters at a high-stakes rally not to flee his ship despite escalating pressure to step aside because of impending corruption charges.
Crowds of flag-waving voters chanting ‘‘Fillon, President!’’ appeared to give him the confidence he needs to keep up the fight.
That support came despite a raft of defections by conservative allies in recent days that threatened to plunge France’s unpredictable presidential campaign into unprecedented disarray just seven weeks before its first-round election.
‘‘No one can stop me from being a candidate,’’ he said on France-2 television Sunday night. The rally, he said was ‘‘a demonstration that my legitimacy remains very strong.’’
He has been summoned to court to face charges on March 15, but has said that will not change his mind.
Fillon, a former prime minister, apologized to voters for errors in judgment but insisted he was being unfairly targeted in an election season. Once the front-runner in France’s presidential race, he is now being eclipsed by two other candidates.
His low-profile Welsh wife Penelope — accused of earning a generous taxpayer-funded salary for years for jobs she never performed — took an unusually public place at his side at Sunday’s rally, waving a tricolor flag before adoring crowds.
Despite the rally, Fillon’s Republicans party remains dangerously divided over his candidacy. Its political committee will hold an urgent meeting Monday to evaluate the situation after Sunday’s rally and the recent defections, including by Fillon’s campaign manager and his campaign spokesman.
Many conservatives want Alain Juppe, another former prime minister who was the runner-up in the party’s primary, to run in Fillon’s place.
Fillon warned that this close to election day, any ‘‘improvised candidacy . . . would lead to failure.’’
Juppe, who has shown little inclination to run as a replacement candidate, plans to make a statement Monday in Bordeaux, where he is mayor. He campaigned on a more moderate platform than the tough-on-security, pro-free market Fillon.
Polls now suggest that far-right leader Marine Le Pen and centrist independent candidate Emmanuel Macron will come out on top in the first-round vote on April 23. The top two vote-getters go on to compete in the May 7 presidential runoff.
A poll released Sunday suggested Juppe would have a better chance at reaching the runoff than Fillon.
Fillon showed no sign of backing down Sunday, however. ‘‘You should not surrender to worry or anger,’’ he told the rally on Place de Trocadero, buffeted by rain and wind. He thanked ‘‘those of you who will never give up the fight, you who always refuse to listen to the siren calls of discouragement.’’
Fillon apologized to his supporters for having to concentrate on defending his family’s honor ‘‘while the most essential thing for you, as for me, is to defend our country.’’
‘‘I committed the first error in the past, in asking my wife to work for me. . . . I shouldn’t have done that,’’ he said. ‘‘And I committed the second in hesitating about the way to talk about it.’’
Dozens of buses brought supporters in from around France, while riot police stood guard. Fillon said 200,000 people showed up at Sunday’s rally, though police estimates were lower.
Hundreds of left-wing protesters held a counterdemonstration across town to denounce widespread political corruption among France’s political elite.
Le Pen is riding high even though she is at the center of several investigations along with her anti-immigration National Front party.
Juppe, the potential savior of conservative chances, was convicted in 2004 for an illegal party funding scheme and barred from elected office for a year.