"We congratulate President-elect Macron and the people of France on their successful presidential election", said Spicer.
Macron's party, previously known as a movement called simply En Marche, is preparing a list of candidates for next month's parliamentary election. He'll be replaced by Catherine Barbaron.
The movement will be renamed as "La R?publique En Marche" on July 15.
Macron's "En Marche" party now has no seats in Parliament, though an opinion poll last week predicted it would emerge as the largest in the parliamentary elections next month. Ferrand also said the names of Macron's 577 candidates in the legislative elections would be announced this Thursday.
The Republican president had tweeted his congratulations to the 39-year-old centrist Macron on Sunday, saying he looked forward to working with him.
Yesterday, American lawmakers also joined the White House in congratulating Macron, a former investment banker whose win in the French polls represented the most significant response from the liberals to the populist and nationalist wave that brought Trump to power in the November presidential election.
Le Pen, 48, had portrayed the ballot as a contest between Macron and the "globalists" - in favour of open trade, immigration and shared sovereignty - and her "patriotic" vision of strong borders and national identities.More news: Bella Hadid, Emily Ratajkowski show leg at Cannes
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The results revealed Macron was favoured among wealthier, better educated citizens in cities, while Le Pen drew support in the countryside as well as poverty-hit areas in the south and rustbelt northeast.
Meanwhile, the far right National Front, whose candidate Marine Le Pen lost to Macron in the second round, is considering changing its name to broaden its appeal.
European shares are set to open higher on Monday, surging to fresh highs after Emmanuel Macron was elected French president with a business-friendly vision of European integration.
But many commentators said the fact that a third of the electorate either abstained or cast blank or spoiled votes on Sunday showed Macron would start his mandate under intense scrutiny. If another party wins a majority, Macron could be pressured to choose a prime minister from that party.
"The EU can't keep feeling its way from one election to the next".
Macron's victory is a relief for Germany, the main defender of the European Union against rising anti-establishment sentiment on the right and left of the political spectrum.
"I will fight with all my strength against the divisions that are undermining us", he said. Speaking to thousands of supporters from the Louvre Museum's courtyard, Macron said that France is facing an "immense task" to rebuild European unity, fix the economy and ensure security against extremist threats.