Jair Bolsonaro was recently detained after months under house arrest while appealing his 27-year sentence for plotting a coup

Former Brazilian President Jair Bolsonaro's alleged attempt to tamper with his electronic ankle monitor while under house arrest was the result of health problems and medication side effects, his lawyers said on Sunday.

Bolsonaro was earlier placed into custody after months of house arrest, with the Supreme Court set to vote Monday on whether to uphold his pre-emptive detention.

In September, the 70-year-old was sentenced to 27 years in prison over attempting to overturn the results of the country's 2022 presidential election. Bolsonaro denies any wrongdoing and his legal team is appealing the verdict. Earlier this month, Brazil's top-court panel unanimously rejected his appeal of the prison sentence.

The ex-president "suffers from concomitant illnesses that require treatment" and takes various medications, including those "affecting the central nervous system," the Agencia Brasil public news agency reported, citing the document submitted by Bolsonaro's lawyers to the Brazilian Supreme Court.

The lawyers reportedly specified that the interaction of the medicines currently taken by the former president are known for "side effects, including altered mental status with possible mental confusion, disorientation, impaired coordination, sedation, impaired balance, hallucinations, and cognitive impairment."

The attorneys requested the court to review the latest ruling to transfer him from house arrest to custody.

Bolsonaro's case stems from an coup plot that according to prosecutors began in 2021 with efforts to erode public trust in Brazil's electoral system. After Bolsonaro's 2022 defeat, they alleged his supporters were urged to mobilize in the capital, Brasilia, where they stormed and vandalized the nation's three branches of government on January 8, 2023.

US President Donald Trump has called Bolsonaro's prosecution politically motivated, imposing steep 50% tariffs on Brazil. Earlier this month, Washington began rolling back some of the levies. The US has also sanctioned Supreme Court Justice Alexandre de Moraes, who ruled the verdict, for what it described as "serious human rights violations," and announced visa restrictions against him and other court officials.

Brazilian President Luiz Inacio Lula da Silva has condemned what he called Washington's pressure tactics, accusing the US of having "helped stage a coup" and vowing that Brazil "will not forget it."