BRATISLAVA, Slovakia (AP) — Slovakia's president has signed a constitutional amendment that makes it possible for lawmakers to annul pardons granted by former Prime Minister Vladimir Meciar that barred an investigation into the kidnapping of the son of late President Michal Kovac.

The authoritarian Meciar was current President Andrej Kovac's political archrival. Meciar led Slovakia into international isolation during the 1990s and is alleged to have been behind Michal Kovac Jr.'s abduction to Austria in 1995.

Parliament approved the constitutional changes Thursday with both Prime Minister Robert Fico's ruling coalition and the opposition joining forces in the vote.

Kiska signed the amendment on Monday and welcomed the move.

Lawmakers might discuss rescinding the pardons as soon as this week.

According to the amendment, the country's Constitutional Court will have the final say.