Thursday's announcement comes days after CIA Director Gina Haspel traveled to Turkey and listened to audio purportedly capturing the journalist's murder, giving a key member of Trump's Cabinet access to the central piece of evidence Turkey has used to assert that the killing was planned.
The murder has sparked an worldwide crisis for Saudi Arabia, whose official narrative changed again on Thursday when a Saudi public prosecutor admitted the murder appeared to have been premeditated.
"We are pleased that is the case", Palladino said, reiterating that the United States is continuing to press for "all the relevant facts" in the killing of Khashoggi in the Saudi consulate in Istanbul on October 2. He was there to pick up marriage papers, with his fiancée waiting outside in their vehicle.
Turkish authorities maintain that Khashoggi was tortured, killed and dismembered in a premeditated operation organized by Saudi government officials.
Saudi journalist Jamal Khashoggi in May 2010.
"First, we know that killing was in the consulate, which is representative of the state of Saudi Arabia", Callamard said.
Trump has also blamed the Saudi de facto leader, who is known in media as "MBS", for the killing of Khashoggi.
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How Western allies deal with Riyadh will hinge on the extent to which they believe responsibility for Khashoggi's death lies directly with the prince and the Saudi authorities.
Mevlut Cavusoglu is Turkey's foreign minister.
Speaking to a packed auditorium of at least 1,400 people, with other attendees lining the walls, the prince promised an overhaul of Saudi security services and said that ties with Turkey would remain strong so long as he and his father, King Salman, were in power.
At a conference in Riyadh on Wednesday, the crown prince said the killing was a "heinous crime that can not be justified" and warned against any efforts to "manipulate" the crisis and drive a wedge between Saudi Arabia and Turkey, which are regional rivals but also diplomatic and business partners.
Khashoggi's eldest son, Salah, and his family arrived on Thursday in Washington on a flight from Saudi Arabia, according to two sources close to the family.
"We will prove to the world that the two governments (Saudi and Turkish) are cooperating to punish any criminal, any culprit, and at the end justice will prevail", he said to applause.
Initially Saudi officials claimed Khashoggi had left the diplomatic mission unharmed; however, under Turkish pressure joined by the questions from the global community, it was forced to confess that he had been killed in a premeditated murder.