At the demand of former foreign minister Avigdor Liberman, ministry officials have been summoned for polygraph tests in order to determine who leaked classified information to reporters, Army Radio reported Thursday.

The report was denied by Liberman’s spokesman.

Members of two top internal ministry advisory boards — the minister’s forum and executive director’s forum —  were reportedly sent to take lie detector tests in recent weeks, at the behest of Liberman, even though he is no longer foreign minister.

It was not clear which leaks were reportedly being investigated.

Liberman stepped down shortly after being indicted on fraud and breach of trust charges late last year, though he has said he intends to return to the position should he be cleared.

The Foreign Ministry told Army Radio it “wasn’t interested in addressing the issue,” and Liberman’s spokesperson denied the former minister had any connection to the events, and didn’t know why the officials were questioned.

However, a source in the ministry told Army Radio he and his peers felt they were being “persecuted.” Whoever talks to reporters, “even if it’s just a polite conversation,” is afraid of losing his job, he said.

Using polygraph tests to find out who chatted with the press and leaked inside stories has been suggested by cabinet ministers in the past. In September, Prime Minster Benjamin Netanyahu considered sending his entire government to be tested after a series of leaks to the press.