The CIA's director is due to brief Donald Trump after listening to an audio recording of the murder of Saudi journalist Jamal Khashoggi.
The US president will meet CIA chief Gina Haspel, who has just returned from Turkey to review intelligence about the killing.
It come as Mr Khashoggi's eldest son flew out of Saudi Arabia after meeting the country's king and crown prince.
A source told Reuters that dual US-Saudi citizen Salah Khashoggi, who had been under a travel ban, was allowed to leave on Wednesday.
His destination has not been disclosed.
Saudi Arabia's public prosecutor said on Thursday that the murder of Mr Khashoggi was premeditated, reversing previous official statements that the killing was unintended.
Investigators have taken water samples from a well at the Saudi consulate in the Turkish capital where the journalist was killed.
However Turkish foreign minister Mevlut Cavusoglu said there are "still questions that need answers" over the murder.
After Saudi Arabia said 18 people had been arrested over the killing, Mr Cavusoglu asked "who gave them the orders?" and pointed out that Mr Khashoggi's body has still not been found.
"Where is (the body)?" he asked.
"You admit they did it, but why are they not saying (where)?"
Two sources have told Sky News that body parts belonging to Mr Khashoggi have been found.
1:08They said the Washington Post columnist had been "cut up" and left with a "disfigured" face.
One source also suggested his remains were discovered in the garden of the Saudi consul general's Istanbul home – located around 500 metres away from the consulate.
It contradicts the explanation being made by Saudi officials that the body was rolled up in a carpet and handed to a local collaborator who was tasked with disposing of the evidence.
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Saudi Arabia has said King Salman was not involved, but any major decision must be signed off by the highest powers within its ruling Al Saud family.
Mr Khashoggi's brother, Sahel, was also invited to a meeting at the Yamama Palace in Riyadh where the king and Crown Prince Mohammed bin Salman expressed their condolences.
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Sky News
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