United States intelligence agencies believe Crown Prince Mohammed ordered an operation to kill Khashoggi, a critic and Washington Post columnist, and say his body was dismembered and removed to a location still publicly unknown.
During the September 2017 conversation, Bin Salman reportedly discussed ways to coax Khashoggi back to Saudi Arabia or how to bring him back forcefully.
The comments were intercepted by American intelligence agencies, the newspaper reported.
While the murder took place on 2 October, authorities only got access to the consulate on 15 October, and not to the residence there until 17 October - which in particular affected the forensic investigation, she wrote.
Al Jazeera reported that Callamard had heard recordings of Khashoggi's last moments.
Meanwhile, UN rapporteur Agnes Callamard presented preliminary findings on Thursday saying that Khashoggi's murder was the effect of a plan hatched by officials of the Kingdom.
The intelligence reports offer some of the most direct evidence of the role the crown prince may have played in Khashoggi's slaying, which sparked weeks of worldwide outrage and protest.
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The "complete lack of transparency" from Saudi officials on the investigation into the murder of journalist Jamal Khashoggi is deeply concerning and detrimental to their credibility, an aide to Turkish President Tayyip Erdogan said.
Riyadh initially denied any knowledge of the journalist's whereabouts but later admitted that Khashoggi had been killed with a drug injection and his body had been dismembered and taken out of the consulate.
A top Saudi official on Friday insisted his country's crown prince had no role in the October slaying of a Washington Post columnist, saying the trial of the suspects and the ongoing investigation would show it was a "rogue operation" with no official backing.
Khashoggi was murdered by a team of Saudi operatives on October 2 a year ago inside the Saudi consulate in Istanbul, where he had gone to collect documents to marry Cengiz.
"The President maintains his discretion to decline to act on congressional committee requests when appropriate", a senior administration official said in a statement.
But the Trump administration has said there is no irrefutable evidence of Prince Mohammed's involvement, and has stressed the importance of the strategic partnership between Washington and Riyadh.
During a press conference in Istanbul for a book on Khashoggi's life, Cengiz left the door open to a meeting with US President Donald Trump if certain conditions were met.
She plans to present a final report to the UN Human Rights Council in June.