Saudi Foreign Minister Adel al-Jubeir went on United States television to insist that the killing was a mistake, and sought to shield the prince from the widening crisis.
The top official characterised Khashoggi's killing as "a rogue operation" and apologised to his family.
He added that the Saudis are now working on finding out where Khashoggi's body is and determining the full details into what happened.
'This is a awful mistake. This is a bad tragedy.
"The Turks have been talking more to the media than they have us", Corker said of the North Atlantic Treaty Organisation ally. "We feel their pain", Jubeir said in an interview with Fox News. They said "those responsible must be held to account".
"In Saudi Arabia, you do not do something of this magnitude without having clearance from the top", Senator Thom Tillis, another Republican, said on NBC's "Meet the Press".
"The individuals who did this did this outside the scope of their authority", al-Jubeir declared.
Khashoggi went missing after entering the consulate to obtain documents for his upcoming marriage.More news: Again, El-Rufai Imposes 24 hours Curfew in Kaduna State
Jamal Khashoggi was a frequent critic of Saudi Crown Prince Mohammed bin Salman, which undermined his reputation as a reformer in the arab world.
Another Saudi official attributed the death to a chokehold.
Mutreb replied, "Yes, we will drug you and kidnap you", in what the official said was an attempt at intimidation that violated the mission's objective.
A member of the team then dressed in Khashoggi's clothes to make it appear as if he had left the consulate.
The Gulf kingdom admitted on Friday that Jamal Khashoggi was killed at its Istanbul consulate but claimed he died after a fight broke out.
"They tried to prevent him from shouting but he died", the official said.
During a party conference in the eastern state of Thuringia on Saturday, Merkel referred briefly to Saudi Arabia and "the awful events" surrounding Khashoggi's death, saying "still nothing has been cleared up".
In a statement Sunday, the governments said attacks on journalists are unacceptable and "of utmost concern to our three nations".
"This really ought to be something that causes us to do a reexamination of our relationship with Saudi Arabia". King Salman, 82, had handed the day-to-day running of Saudi Arabia to him. "I'm not satisfied until we find the answer", he said.