"State Department senior officials have spoken with the Kingdom of Saudi Arabia through diplomatic channels about this matter".
A Turkish police source told the Middle East Eye that officials believe Khashoggi was "brutally tortured, killed and cut into pieces" while inside the consulate.
Saudi officials talking to state media have said that the journalist left the consulate after his visit, denying the Turkish claims. There were no details about when the search would take place. Regardless, Khashoggi's last known whereabouts was there at around 1:14 p.m. local time last Tuesday.
Trump said he expected to have more information about what happened to Khashoggi soon.
"The request that America made to Saudi Arabia and other OPEC countries is to be sure that if there is any loss of supply from Iran, that we will supply that".
Since the disappearance of Khashoggi, activists and journalists have gathered by the Saudi consulate in Istanbul nearly every day in the last week to rally in support of the missing writer. "The consulate officials can not save themselves by simply saying, 'He has left, '" Erdogan said Monday on a visit to Budapest. "Maybe we'll be pleasantly surprised, but somehow I tend to doubt it". They claim he left the consulate on the same day he entered it.
Turkish President Recep Tayyip Erdogan meanwhile asked Saudi Arabia to provide CCTV images to back up its assertion that Khashoggi had left the consulate safely. "We want to find out what happened", Trump told the morning news program Fox & Friends.
Khashoggi, a self-exiled writer for The Washington Post, was reportedly visiting the consulate to acquire the papers to prove that he was divorced.
Khashoggi, a familiar face on political talk shows on Arab satellite television networks, had been an adviser to Prince Turki al-Faisal, former Saudi intelligence chief and ambassador to the United States and Britain.
Erdogan had said on Sunday that authorities still expect a positive outcome in Khashoggi's disappearance, noting that he is waiting for the results of investigations on the disappearance of the Saudi journalist.