The leader of the extreme right Marine Le Pen threatened on Monday to withdraw support for France’s coalition government after talks with Prime Minister Michel Barnier failed to meet her party’s demands for budget concessions.

Le Pen said nothing had changed after the talks and that she was not optimistic a compromise could be reached on the 2025 budget bill.

“Nothing seems less certain,” he told reporters.

The Senate began debating the bill on Monday after lawmakers in the National Assembly rejected it after left-wing lawmakers largely revised it in the lower house, adding tens of billions of euros in tax increases.

Opposition parties are now threatening to topple Barnier’s government, and his fragile coalition relies on the tacit support of Le Pen’s National Rally party for its survival.

The government is seeking to squeeze 60 billion euros ($62.85 billion) in savings through tax increases and spending cuts to reduce the deficit to 5 percent of economic output next year from over 6 percent this year.

The National Rally has said it will support efforts to topple the government if its demands are not met. Le Pen said last week that her party opposes increasing the tax burden on households, entrepreneurs or pensioners, and that so far these demands are not reflected in the budget bill.

Barnier is already struggling to keep the 2025 budget within the government’s deficit targets while Budget Minister Laurent Saint-Martin acknowledged on Monday that the budget deficit may be slightly higher than the 5% of output initially forecast.

Barnier’s struggles to secure approval for the budget have fueled speculation that he will invoke Article 49.3 of the constitution, which allows the text to be approved without a vote. Such a move could trigger a motion of censure against the government.

“It is true that we find very little quality in this budget and very little time for the government to try to increase its qualities and reduce its defects,” Le Pen said.

An official in Barnier’s office described his talks with Le Pen as “constructive, polite and frank”.

Barnier was also scheduled to meet with other political leaders on Monday to seek a compromise on the budget bill. The Senate is scheduled to vote on the overall budget on December 12.