Emmanuel Macron, the French President, has appointed a former aide to his predecessor Nicolas Sarkozy to become his new prime minister. Edouard Philippe, a growing and popular figure in French politics, resigned as prime minister along with the entire government on Friday as Macron looked to shake-up his ailing presidency. The new prime minister, Jean Castex, is a low-profile conservative figure who emerged from the shadows while coordinating France’s post-pandemic reopening.