An aide to Israeli Prime Minister Benjamin Netanyahu has been named as a primary suspect in an investigation to determine who leaked classified documents to foreign media regarding a ceasefire deal.

The documents that were leaked, the veracity of which have been called into question, supported Netanyahu’s case to add a tougher condition to Israel’s stance in negotiations for a ceasefire and hostage deal with Hamas. Critics of Netanyahu have accused him of sabotaging a deal and prolonging the war for political reasons.