The joke planned by campaigners for Francois Fillon involved fake glasses that mocked his prominent eyebrows.
France's polling commission warns that a Russian news story saying Fillon is in first place is 'non-representative' of the polling reality.
Polls are tightening, with third-place Francois Fillon picking up support and Macron and Le Pen nearly neck and neck.
The former presidential frontrunner is criticized for spinning 'conspiracy theories.'
Moscow has dismissed allegations that François Fillon received $54,000 to introduce a businessman to Putin.
Francois Fillon's conservative party apologizes for tweeted image featuring anti-Semitic stereotypes.
Onetime frontrunner has been mired in scandal over allegedly paying his wife for a no-show job.
"I won't give in, I won't surrender, I won't pull out, I'll fight to the end," Fillon said.
National Front leader vows to expel illegal migrants, curb immigration, take France out of the euro zone and levy protective tariffs.
A survey found 69 percent of people wanted Fillon to drop his bid.
The probe will look into alleged misuse of public funds by the presidential frontrunner.
Leading contender Manuel Valls, the former prime minister, is seen as not likely to prevent a runoff between conservative Francois Fillon and far-right Marine Le Pen.
Hollande's decision leaves an opening for a Socialist to challenge Marine Le Pen and Francois Fillon.
If the former prime minister prevails over Alain Juppe, he will face National Front's Marine Le Pen and a Socialist candidate.
Unpopular president is forecasted to lose a three-way race between Marine Le Pen and the winner of the Les Republicains' primary.
France's presidential frontrunner has been criticised over comments suggesting that Jews had not wanted to integrate in France in the past.
A runoff is expected between Francois Fillon and Alain Juppe for the right to face the National Front's Marine Le Pen in the presidential election in 2017.
Alain Juppe is the favorite, with former president Nicolas Sarkozy and Francois Fillon also vying to face National Front leader Marine Le Pen.