French Defense Minister Sebastien Lecornu, left, receives President Emmanuel Macron at the 55th International Paris Airshow at Le Bourget Airport near Paris, June 20, 2025. Benoit Tessier / AP

French President Macron late Tuesday appointed Defense Minister Sébastien Lecornu as France's new prime minister and tasked him with immediately trying to get the country's fractious political parties to agree on a budget for one of the world's biggest economies.

Lecornu, 39, was the youngest defense minister in French history and was overseeing a major military buildup spurred by Russia's war in Ukraine. A longtime Macron loyalist, Lecornu is now France's fourth prime minister in barely a year.

A former conservative who joined Macron's centrist movement in 2017, Lecornu has held posts in local governments, overseas territories and during Macron's yellow vest "great debate," when he helped manage a surge of anti-government protest with dialogue. He also offered talks on autonomy during unrest in the French overseas region of Guadeloupe in 2021.

His rise reflects Macron's instinct to reward loyalty, but also the need for continuity as repeated budget showdowns have toppled his predecessors and left France in drift.

Macron's quick decision to name Lecornu comes ahead of a day of mass disruption planned for Wednesday by a protest movement called "Block Everything" that has prompted the government to deploy an exceptional 80,000 police to keep order.

Legislators toppled Lecornu's predecessor Francois Bayrou and his government in a confidence vote on Monday, a new crisis for Europe's second-largest economy.

Bayrou gambled that lawmakers would back his view that France must slash public spending to rein in its huge debts. Instead, they seized on the vote to gang up against the 74-year-old centrist who was appointed by Macron last December.

The demise of Bayrou's short-lived minority government heralds renewed uncertainty and a risk of prolonged legislative deadlock for France as it wrestles both with its internal budget difficulties and, internationally, wars in Ukraine and Gaza and the shifting priorities of U.S. President Trump.

Drafting a budget will be a top priority for Lecornu, and normally a new prime minister would form the new government before negotiating the nation's finances in Parliament. However, Macron has asked Lecornu to first consult with all of the political parties in Parliament first to try to agree on a budget before assembling his team.

"The prime minister's action will be guided by the defense of our independence and our power, serving the French and the political and institutional stability for the unity of our country," Macron said in a statement.

When the 2018 yellow vest movement against social injustice erupted, prompting months of sometimes violent demonstrations in the streets, Lecornu was chosen by Macron to lead the so-called "great debate" across the country aimed at appeasing tensions.

A minister of overseas territories from 2020 to 2022, Lecornu faced rioting and strikes linked to the pandemic in Guadeloupe, located in the Caribbean, and offered to discuss greater autonomy for the territory from the French mainland.

The 413 billion euros ($435 billion) defense spending package Lecornu championed for 2024-2030 represents the most significant spending hike in France in half a century. The money aimed to modernize France's nuclear arsenal, augment intelligence spending and develop more remote-controlled weapons.

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