The announcement of the new government had been expected on Tuesday evening, but a statement from Mr Macron's office said the announcement will come on Wednesday and blamed the delay on the need to verify the tax status and potential conflicts of interest of the candidates.
Jean-Yves Le Drian, 69, who led France's military operations overseas as former President Francois Hollande's defense minister, will stay on in Macron's government as foreign minister and also be in charge of European affairs.
The draft law, suggested and wanted by Macron's ally, leader of the Democratic Movement Party, Francois Bayrou, includes "the prohibition of nepotism for parliamentarians", especially after a fictitious jobs scandal hurt the candidacy of conservative presidential hopeful Francois Fillon.
Philippe's age reinforced the generational shift in France's corridors of power and the image of youthful vigour that Macron is cultivating.More news: Trump Administration Reveals Classified Information to Russian Officials
In Berlin, Macron declined to answer a question about his new prime minister, only saying the choice of Philippe is part of the new political landscape he's promoting.
Center-right Prime Minister Edouard Philippe, whom Macron tapped named Monday, is to lead the government at least until the elections.
Macron is seeking to attract members from both the right and left to his new political party, La République en Marche (Republic on the Move), in time for next month's parliamentary elections.
One of Macron's most controversial ideas is a shared budget for the countries that use the euro currency.More news: Traders Buy Large Volume of Put Options on Walt Disney (DIS)
Co-president of Paris 2024 bid Tony Estanguet, front right, takes a selfie of the back row from left, International Olympic Committee Evaluation Commission Chair Patrick Baumann and new French President Emmanuel Macron, member.
On the occasion of the investiture of the new president, which took place on May 14, the Pope sent his good wishes for the exercise of the office, that it be "at the service" of all the people of France. REUTERS/Philippe Wojazer Brigitte Trogneux, wife of French President Emmanuel Macron, reacts at the Hotel de Ville in Paris, France, May 14, 2017.
That should give a welcome burst of energy to the much-maligned European Union and efforts to fix it, even if Macron and Merkel won't necessarily agree on how.
Germany, too, has supported greater defence co-operation, but not all European countries are on board - and it is not clear how such a new structure would work alongside US -dominated North Atlantic Treaty Organisation.More news: Home Depot raises outlook as housing market grows
The 69-year-old represents the moderate, centrist wing of the party and was elected to the French National Assembly aged 34 in 1981, when Macron was a toddler.
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