France's far-right National Rally will force the collapse of Prime Minister Michel Barnier's government unless in a "last minute miracle" he yields to their demands on the budget, its president Jordan Bardella said.

Far-right leader Marine Le Pen, who holds outsize leverage in France’s split parliament, gave Prime Minister Michel Barnier until Monday to adhere to her budget red lines before she decides whether to topple the government.

French Prime Minister Michel Barnier's government faces a major test over approval of a disputed draft budget, with far-right leader Marine Le Pen threatening a no-confidence vote in parliament should its budget demands not be addressed.