PARIS—Anti-immigrant leader Marine Le Pen is engaged in a high-stakes game of chicken with the French government and a multitude of global investors who finance the country’s sizable debt load.For weeks,

Good morning. Marine Le Pen’s party pledges to topple the French government. How a billionaire’s “baby project” ensnared dozens of women. And the white sands and azure waters of St. Tropez are a luxury hotel brand’s next target.

The end of Michel Barnier’s government looks inevitable, even imminent, and would add to the country’s political malaise. The only question seems to be: How long can he last?