Macron secured two-thirds of the votes in a runoff round on Sunday, inflicting a clearer than expected defeat on the National Front candidate and her plan to exit the eurozone and erect protectionist barriers.
"President Trump emphasized his desire to work closely with president -elect Macron in confronting shared challenges, and noted the long and robust history of cooperation between the United States and its oldest ally, France", the White House said.
If Mr Macron's party performs poorly, he could also be forced to form a coalition government, a regular occurrence in many European countries but far less common in France.
His party is changing its name to La Republique En Marche (Republic on the Move) as it prepares a list of candidates. Benjamin Griveaux, a spokesman for the president-elect, told French radio that Valls had not yet submitted his application online to join the party.
An estimation by research firm Elabe for BFMTV show that Macron won the presidential race with 65.9 percent of votes, while Le Pen scored 34.1 percent. France's two mainstream parties the conservatives and socialists have other ideas. The candidates will be announced by Thursday.
Le Pen may have lost, but she's proving that her party and, more importantly, her message of reduced immigration and more nationalistic and France-first policies, are popular with millions of French voters.
The Republicans, Le Pen's National Front and Socialists all held meetings today to discuss strategy.
Guillaume Balas, who co-ordinated Mr Hamon's platform, said Mr Valls "excluded" himself from the party with his allegiance to Mr Macron's movement.
Yesterday, the president-elect joined French President Francois Hollande to commemorate the end of World War II. If so, he will be able to choose a prime minister.
The fervently pro-European Macron wants to team up with Germany to reform the 28-member European Union, seen as critical now that Britain is set to leave.
Economy Commissioner Pierre Moscovici called on him to rein in the budget deficit of the Eurozone's second-biggest economy.
Commission chief Jean-Claude Juncker has appealed to him to mind the public purse.
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