Israeli Prime Minister Benjamin Netanyahu is under growing pressure to come clean over his government's alleged role in the botched assassination attempt of a Hamas leader in Jordan.
An Israeli newspaper report on Sunday accused him of overruling the advice of his security chief and ordering the killing to go ahead.
Prime Minister Benjamin Netanyahu held a security cabinet meeting on Sunday to discuss the crisis.
The spy drama has rocked relations with Jordan and damaged peacemaking efforts.
Israeli Prime Minister Benjamin Netanyahu called together his security cabinet on Sunday in an effort to face off growing criticism over the failed assassination of a Hamas leader in Amman last week.
There were calls Sunday for a government inquiry into the affair, and some opposition lawmakers called for Netanyahu's resignation.
In the government's first public statement about the attack, Cabinet Secretary Danny Naveh refused to confirm explicitly that Netanyahu's government had carried out the attack on Khaled Mashaal.
But in an implied admission of Israel's involvement he defended Israel's right to fight terrorism "without compromise."
"The government of Israel at this stage is forbidden to address what has been publicised as activities against Hamas leader Khaled Mashaal, the number one figure of Hamas and responsible for the murder of many Israelis citizens. The government's obligation is to defend the lives of its citizens and to fight terror without compromises."
SUPERCAPTION: Danny Naveh, Israeli Cabinet Secretary
After a quiet four-day holiday weekend, Israeli media focused on the political storm that's quickly enveloped Netanyahu over the alleged
role of Israel's Mossad intelligence agents in the attack.
The former Israeli Prime Minister, Shimon Peres, said that the responsibility falls on Netanyahu.
"The way and the purpose and the means by which they were carried out created a failure that all of us regret deeply. I think that we have to draw very serious conclusions from it. First of all, that it won't be repeated in the future and secondly that the people responsible for this mishap will pay the cost of the failure."
SUPERCAPTION: Shimon Peres, Former Israeli Prime Minister
The "Sunday Times" revealed on Sunday that the head of Israel's Mossad security service, Danny Yatom, was strongly opposed to the operation but was overruled by Netanyahu.
Khaled Mashaal, seen here with his family, was injected with a toxic substance on 25 September.
The former head of Mossad has warned that the terrorists should never think themselves untouchable.
"The terrorist organisations, the heads of terrorist organisations take into account that Israel may have its own constraints on carrying out operations on the territory of a friendly nation. We don't do it just out of will but we definitely cannot allow the heads of terrorist organisations to find haven in foreign countries and to feel that they are immune."
SUPERCAPTION: Nahum Admoni, Former head of Mossad
Former deputy head of Israeli secret service, Gideon Ezra said that the current situation should not affect the relationship between Israel, Jordan and Canada
"All the men that took part in the decision, these are the people that we should ask the question and to see if they are wrong in their decision.
Q: And does that include the prime minister?
A: Everybody including the prime minister."
SUPERCAPTION: Gideon Ezra, Former deputy head of Israeli secret service
The incident has caused a diplomatic storm.
Canada recalled its ambassador from Israel in protest of the attack by two men carrying Canadian passports.
Jordan's King Hussein, in an interview published Sunday in the London-based Al-Hayat newspaper, called the attack "a reckless act carried out by a party that has no faith in peace."