Prosecutors say the case concerns suspected abuse of authority while Jaki was deputy justice minister under the previous Law and Justice (PiS) government responsible for oversight of the prison service.
They allege he ordered a rapid promotion of a prison service officer despite legal requirements not being met.
The request, submitted by Prosecutor General and Justice Minister Waldemar Żurek to the European Parliament, also seeks permission for Jaki to be detained and brought in by force, which prosecutors describe as a precaution against possible obstruction of the investigation.
According to prosecutor’s spokesperson Anna Adamiak, investigators have gathered evidence suggesting the promotion took place while disciplinary proceedings were ongoing against the officer, resulting in financial and career benefits.
The alleged actions relate to the Polish Prison Service and form part of a broader investigation into its functioning between 2015 and 2023.
Jaki has denied wrongdoing, writing on social media that the case amounts to "a mockery of the state" and accusing the authorities of political persecution.
The European Parliament must now decide whether to lift his immunity before any criminal proceedings can move forward.
In April, it approved a similar request in a separate case involving a private prosecution brought by judge Igor Tuleya.
(ał)
Source: PAP, IAR