Akar's comments in Canada come as Saudi Arabia's foreign minister Adel al-Jubeir told Asharq al-Awsat news, that Turkish president Recep Tayyip Erdogan had not claimed that the murder order was "given by senior Saudi government officials, but not MBS".
The 59-year-old Khashoggi was last seen entering the Saudi consulate in Istanbul on October 2 to obtain paperwork for his marriage.
Turkey has called for an worldwide investigation of the killing of Khashoggi, a Washington Post columnist.
But US President Donald Trump has praised Saudi Arabia as a "truly spectacular ally" and has refrained from blaming Prince Mohammed despite the Central Intelligence Agency's reported assessment that he was behind the killing.
King Salman was speaking at the annual Shura council in Riyadh.
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Fox interviewer Chris Wallace asked Trump whether he would go along with moves in Congress to cut off USA involvement in the Saudi-led war in Yemen or halt arms sales to Riyadh.
The new evidence, the report said, would expose "perhaps the United Arab Emirates (UAE) and Egyptian intelligence's role in the incident, and as a matter of fact, information on Israeli intelligence's expertise or on the USA leg of the murder".
The moves represent a sharpening of the position of Germany, which last month imposed a ban on the issuing of future export weapons export licenses to Saudi Arabia until the circumstances of Khashoggi's killing have been fully cleared up.
The king had largely stepped back from active political life and handed extensive authority to his son and heir apparent, Crown Prince Mohammed bin Salman, but is now trying to defuse the crisis caused by the murder and shore up the crown prince.
His body has yet to be returned to his family amid reports that it was chemically dissolved.
Foreign Minister Heiko Maas told reporters in Brussels the decision was closely coordinated with France, which is part of the Schengen zone, and Britain, which is not. In a later conversation among the killers, one can be heard complaining about having to wear their victim's clothes, in an attempt to lay a false trail for investigators following Khashoggi's disappearance.