Two out of five Supreme Court justices tasked with deciding the fate of the former Brazilian president, Jair Bolsonaro, have found the ex-leader guilty of plotting a coup.
But Bolsonaro will only be convicted if at least one more justice finds him guilty. The former president has denied all the charges against him.
The first justice to cast his vote, Alexandre de Moraes, said there was no doubt that there had been a coup attempt after Bolsonaro lost the 2022 presidential election to his left-wing rival, Luiz Inácio Lula da Silva.
The second justice, Flávio Dino, also found Bolsonaro guilty of all the five charges against him. The trial will continue on Wednesday.
When the session starts at 09:00 local (12:00GMT), all eyes will be on Justice Luiz Fux, whose turn it will be to cast his vote.
If he also finds Bolsonaro guilty on all the charges, the simple majority needed to convict the former president will have been reached.
If convicted, Bolsonaro - who governed Brazil from January 2019 to December 2022 - could face a lengthy sentence of more than 40 years in prison.
So far, the statements by the two justices who have cast their votes have been damning for the former president.
Justice Moraes said that Bolsonaro had led the criminal organisation which he alleged was behind the attempted coup.
Bolsonaro's lawyer, Celso Vilardi, said he did not agree with the two justices' views but stressed he would always respect the decision of the Supreme Court.
The former president and his seven co-defendants in the trial - some of whom are top military officers - stand accused of trying to prevent President-elect Lula from taking up office.
The trial has deepened divisions in Brazil, with supporters of Bolsonaro alleging that the five-member panel tasked with the case is biased. Critics of Bolsonaro, on the other hand, say that Brazil's institutions need to act decisively when under attack.
