When asked if he would impose sanctions on the Saudis, he said it "depends on what the sanction is". James Lankford, R-Okla., who was at the White House for the arrival of American pastor Andrew Brunson, who was released from Turkey after almost two years of confinement.
Mnuchin told The Washington Post that in addition to the conference, another major focus of his trip is visiting the Terrorist Financing Target Center, set up in Riyadh with the cooperation of other Persian Gulf nations and the United States.
What about the arms deal?That could have implications for how Turkey moves forward.
The Florida Republican continued: "With nearly full unanimity across the board, Republicans and Democrats, there will be a very strong congressional response if, in fact, Saudis lured him into that consulate, murdered him, and cut up his body and disposed of it".
According to Saudi-owned Al Arabiya television, the kingdom has "over 30 measures" it could implement. Saudi Arabia has denied that. "If the price of oil reaching $80 angered President Trump, no one should rule out the price jumping to $100, or $200, or even double that figure", he wrote.
"Markets start to price in a fundamental change in the nature of the relationship between the USA and Saudi Arabia", said Jaap Meijer, managing director and head of equity research at Arqaam Capital.
Yemeni Nobel Peace Prize laureate Tawakkol Karman (center) joins a demonstration outside the Saudi consulate in Istanbul earlier earlier this month.
"The Saudis have treated Turkey like a third-class country", he said.
Khashoggi, a Washington Post contributor, vanished after entering the consulate on October 2.
Saudi King Salman called President Recep Tayyip Erdoğan, thanking him for the recently formed joint Turkish-Saudi working group to investigate the disappearance of journalist Jamal Khashoggi, who is feared to have been murdered by a team of Saudi agents in the kingdom's Istanbul consulate. Prince Mohammed has said the journalist left the building unharmed, but Saudi officials have given no evidence to back up that assertion.
Meanwhile, there is concern Khashoggi's disappearance could add to a sense that Saudi policy has become more unpredictable under Crown Prince Mohammed bin Salman, who is pushing social reforms to modernise the kingdom but has also presided over a rise in tensions between Riyadh and several other countries.
It has been reported that Turkish authorities have obtained audio and video recordings of the alleged murder. USA officials say they are seeking answers from the Saudi government and are not yet accepting the Turkish government's conclusions.