“We are living in strange and worrying times, times of a coup and pretending and treachery,” she said in the capital Brasilia. “Yesterday, they used the pretense of a leak to give the order for the conspiracy.”

Rousseff is in the final stretch of a bruising attempt to save her presidency from impeachment on charges that she illegally manipulated government accounts to mask the effects of recession during her 2014 re-election.

After a congressional committee voted to recommend Rousseff’s ouster in chaotic and bad-tempered scenes late Monday, the stage was set for a showdown in the full lower house this weekend.

Deputies were due to start debating Friday, with a decisive vote on Sunday, officials said.

“Voting will begin on Sunday at 2pm and we calculate that the result will be late that evening,” a spokesman for the speaker’s office said.

If the house reaches a two-thirds majority, or 342 deputies, Rousseff’s case is sent to the Senate. Anything less, and Rousseff will walk away with her job.

The latest survey of the 513 deputies in the lower house by Estadao daily on Tuesday showed 300 favouring impeachment and 125 opposed. That left the result in the hands of the 88 deputies still undecided or not stating a position.

Rousseff risks being abandoned by at least part of the PP, one of the larger parties previously largely favorable to her, Brazilian media reports said.

The PP was huddled for hours of meetings but was set to declare it would vote pro-impeachment, the still unconfirmed reports said.

“The act represents a new reversal for [the president] and deepens the sensation that the president is isolated,” said Folha newspaper.

However, the PP could end up split, in which case deputies would be given free votes.

Rousseff is hugely unpopular as Brazil sinks into its worst recession in decades. The political system has also been paralyzed by a huge corruption scandal at state oil company Petrobras.