"[Le Pen] will not be able to have many lawmakers at the legislative elections because she does not have any allies (except for [Nicolas] Dupont-Aignant) and lost her credibility", di Borgo said.
The centrist's emphatic victory, which also smashed the dominance of France's mainstream parties, will bring huge relief to European allies who had feared another populist upheaval to follow Britain's vote to quit the EU and Donald Trump's election as US president.
Mr Macron won the presidency with 66% of votes cast for a candidate.
The president of European Jewish Congress, Moshe Kantor, said in a statement: "We remain extremely concerned by the still large support for parties of the far right, not only in France but across Europe".More news: Teens Risk Lives By Climbing Golden Gate Bridge Without Safety Gear
Hollande will delegate his powers to Macron on Sunday, May 14.
On Monday, though, Hollande gripped Macron's arm before the two men walked side by side.
According to Le Monde, a quarter of registered voters did not show up to vote, making the turnout of 75 percent the lowest recorded in any final round of the presidential elections since 1969.
With legislative elections just five weeks away, the start-up political movement the 39-year-old former investment banker launched one year ago on his meteoric ride to become France's youngest president lost no time Monday in girding for the crucial mid-June election battle.More news: Nicky Hayden remains in 'extremely serious' condition, doctors confirm
Monday also marked decades of peace in Western Europe, something Macron made a cornerstone of his campaign against Le Pen's brand of populism. Le Pen had called for France to leave the 28-nation European Union and drop the shared euro currency in favor of bringing back the French franc.
Le Pen, whom the chief rabbi of France and the CRIF umbrella of Jewish communities have decried as risky to democracy and minorities, received 34.2 percent of the vote compared to the 65.8 percent for the centrist candidate Emmanuel Macron, according to a report by Le Monde based on exit polls from Sunday's final round of the elections.
The French president-elect, Emmanuel Macron, plans to visit German Chancellor Angela Merkel shortly after his inauguration, according to Sylvie Goulard, a member of the European Parliament and a close confidante of Macron.
Among the approximately 450 candidates set to be announced on Thursday will be a number of familiar political faces from the Socialist party and from the centrist party Modem, headed by Macron ally Francois Bayrou. In interviews on Monday her campaign director David Rachline said the party founded by her father would get a new name as bait to pull in a broader spectrum of supporters in France.More news: Pep To Offer Yaya New Contract
"The only credible change would be for Marion Le Pen to replace Marine Le Pen, because she is clearly superior to her", di Borgo said.