Lecornu, who was appointed by President Emmanuel Macron last month and had earlier served as defence minister, unveiled his cabinet late on Sunday. But the line-up, which included only few changes from previous governments, drew sharp criticism from both the opposition and within parliament.
Barnier said on Friday that his government, which lacks a clear majority in a hung lower house of parliament, will include conservatives as well as members of Macron's camp.
French President Emmanuel Macron has appointed former chief Brexit negotiator Michel Barnier as the new Prime Minister of France, the Elysee said in a statement on Thursday.