Describing France's spiralling national debt as "a terribly dangerous period… a time of hesitation and turmoil", Bayrou warned there was a "high risk of disorder and chaos" if parliament failed to back his austerity budget with its aim to slash government spending by €44bn (£38bn).
Bayrou says young people will be saddled with years of debt payments "for the sake of the comfort of boomers", if France fails to tackle a national debt of 114% of its annual economic output.
But Bayrou's gamble – variously characterised as a kamikaze gesture, a pointless Cassandra-like prophecy, and an attempt to end his political career with a heroic act of self-sacrifice – looks almost certain to end in failure later on Monday.
Despite some frantic last-minute discussions, it appears clear Bayrou simply doesn't have the votes.
At the heart of this "crisis" – a word that seems to have spent an entire year dominating French newspaper headlines – is President Emmanuel Macron's widely derided decision, in June 2024, to call a snap parliamentary election in order to "clarify" the balance of power in parliament.
The result was the exact opposite of clarity. French voters, increasingly unhappy with their brash, eloquent young president, edged towards the extremes, leaving Macron floundering with a weakened minority centrist government, and a parliament so divided that today many rival MPs cannot even bear to shake each other's hands.