The panel issued a questionnaire, seeking replies supported by documentary evidence.

Sources said that the panel asked a range of questions related to the case, including inquiries about money transfers, cabinet clearance, land allocation for the Al-Qadir Trust and a record of donations.

Additionally, they inquired about the confidentiality of the summary and its approval by the cabinet without discussion.

According to the sources, the PTI chief told NAB that the entire process involving the NCA was overseen by his former aide on accountability Shahzad Akbar.

Khan said he had no direct involvement in the process, as he received verbal briefings.

The PTI chief said Akbar should be summoned from London for further investigation, Geo news reports.

The sources quoted him as saying that the property tycoon was spiritually motivated by the vision of the Al-Qadir University Trust and had donated the land for its establishment.

Originally scheduled for June 7, the NAB had initially summoned both Khan and his wife, Bushra Bibi, but they requested a postponement, according to media reports.

The NAB team rescheduled the summoning of the PTI head for June 8, while Bushra Bibi received a summons for June 13.

(With UNI inputs)