Israeli Prime Minister Benjamin Netanyahu made a rare appearance by a serving premier before the country's Supreme Court on Sunday to defend a contentious natural gas deal.
Critics say the agreement between the government and a consortium including US firm Noble Energy, pushed by Netanyahu, overly favours the firms involved and have petitioned the court to block it.
There have also been denunciations of political manoeuvring by Netanyahu to override anti-trust authorities.
"Today I appeared before the Supreme Court," he told visiting US Jewish leaders at a conference in Jerusalem on Sunday evening.
"I asked to appear before the Supreme Court. It's the first time an Israel prime minister has asked to appear before the Supreme Court in our history," he said.
"The current plan has no alternative and if it is not approved it will cause the country long-term harm," private television station Channel Two reported him as saying in court earlier.
"Without this plan there will be no competition, no development, no investment."
Entrance to the courtroom was restricted, with no broadcasting or recording allowed. Neither the government not the court released details of Netanyahu's address.
The deal he champions concerns development of the Leviathan field in the eastern Mediterranean, described as one of the largest recent natural gas discoveries.
"Israel can be an energy-exporting country," Netanyahu told the conference in Jerusalem.
Currently only the Tamar field west of the port of Haifa is in production, and the government argues that depending on a single source which is a potential target for sabotage means that diversifying supply is of strategic as well as economic importance.
"We shall not have energy security as long as we have only one gas field, which is within range of missile fire" from enemies such as Hezbollah in south Lebanon, Energy Minister Yuval Steinitz told the court on February 3.
Israel's monopolies commission opposed an initial agreement between the government, Noble and its Israeli partner Delek, leading to months of further negotiations under strong political pressure.
To sidestep the commission, Netanyahu used an obscure clause allowing the deal to be pushed through by the economy minister. After the incumbent minister resigned rather than overrule the regulators Netanyahu then took over the post himself.
The size of the Leviathan field is estimated at 18.9 trillion cubic feet (535 billion cubic metres, or bcm) of natural gas, along with 34.1 million barrels of condensate.
Noble and Delek also control Tamar, which holds 250 bcm of natural gas, and lies 80 kilometres (40 nautical miles) west of Haifa.