The background is that Hungary did not apprehend Israel's Prime Minister Benjamin Netanyahu when he visited Hungary in April. Netanyahu is wanted by the ICC, suspected of war crimes and crimes against humanity in Gaza.
Since Hungary has signed the Rome Statute - the treaty that establishes and enforces the ICC, the country is obliged to apprehend wanted persons if they are within the country's borders.
When Netanyahu visited Hungary earlier this year, he received a warm welcome from the country's president Viktor Orbán.
The group of judges who reported Hungary writes that the country's failure to apprehend Netanyahu "seriously undermines the court's ability to enforce its mandate".