Yemeni Nobel Peace Prize laureate Tawakkol Karman (center) joins a demonstration outside the Saudi consulate in Istanbul earlier earlier this month.
Turkish officials have said they believe he was murdered there.
The network said it will air the interview in full on Sunday evening.
Trump said he would meet with Khashoggi's family.
He said any response to Khashoggi's killing "needs to be strong, not symbolic", including the possibility of cutting off USA weapons sales to Riyadh, or it would undermine the U.S.'s moral standing in the world. However, Apple Watches do not have a fingerprint ID unlock function like iPhones.
Reports suggest an assault and struggle took place in the consulate after Mr Khashoggi entered the building to get paperwork for a marriage.
However they have not presented any evidence to corroborate their claim and say that video cameras at the consolate were not recording at the time. It echoes how Russian Federation has described the men who allegedly carried out the Novichok nerve agent poisonings in Salisbury, England, in March.
Saudi stocks dived 7.0 percent in early trading on Sunday as the oil-rich kingdom comes under increasing worldwide pressure over the disappearance of journalist Jamal Khashoggi. However, a column published in English a short time later by the general manager of the Saudi-owned Al-Arabiya satellite news network suggested Saudi Arabia could use its oil production as a weapon.
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Turkey said on Thursday it had accepted a proposal from Saudi Arabia to cooperate on the investigation.
Trump, who's attacked the press as the "enemy of the people", says "there's a lot of stake, and maybe especially so because this man was a reporter". "We're being very tough and we have investigators over there and we're working with Turkey and Saudi Arabia".
Trump said he would probably speak to Saudi Arabia's King Salman over the weekend "because I think it's appropriate for me to ask him what's going on".
Separately, Secretary of State Mike Pompeo spoke to Khashoggi's fiancee, Hatice Cengiz, the State Department said Friday.
No details of the conversation were released.
A spokesperson for the conference told Reuters that they still plan to go ahead with the event despite the disappointing news that some speakers and partners had pulled out.
Amnesty International demanded the Saudi authorities reveal what happened to Khashoggi as it said Riyadh was "responsible at a minimum for enforced disappearance".
A Saudi delegation arrived in Turkey for talks, officials said on Friday, with the case risking fragile relations between the two.
The minister added that his country was "in compliance with worldwide laws and conventions", the official Saudi Press Agency reported him as saying.