A federal prosecutor in Argentina is asking that former President Cristina Fernandez and her son be investigated in a money laundering and tax evasion probe.

Federal prosecutor Carlos Rivolo made the formal request Monday to Judge Claudio Bonadi. The judge is overseeing an investigation involving two businessmen with ties to a real estate company owned by Fernandez and her son Maximo Kirchner.

Under Argentine law, such a request precedes any charges, which must be decided on by a judge.

Prosecutors say the company rented properties from businessmen Lazaro and Cristobal Lopez. They're being probed for illegal enrichment during the 12 years that Fernandez and her late husband and predecessor as president, Nestor Kirchner, were in power.

Fernandez went before Bonadio last month as part of a state fraud investigation.