Minister Alexandre de Moraes of the STF is set to receive Jair Bolsonaro's lawyers this week before deciding whether to extend the former president's house arrest.
Bolsonaro completed 90 days under the regime on Thursday. The initial expectation had been for automatic renewal of the benefit.
The seizure of a weapon registered in the former president's name prompted Moraes to reconsider the decision. The minister requested statements from the PGR and the defense on whether it represented a violation of the precautionary measure.
PGR head Paulo Gonet argued for waiting until the end of investigations into the episode. Bolsonaro's lawyers deny that the former president committed any irregularity.