While Mnuchin canceled his attendance at an investment conference in the Saudi capital this week, he still traveled to Riyadh for a meeting with Crown Prince Mohammed bin Salman, who is widely suspected of playing a role in Khashoggi's death.
Trump has come under bipartisan criticism for taking a soft stance on the Saudis and as recently as last weekend called the government's story "credible".
Speaking to reporters at the White House, Trump said the entire operation was a fiasco. "It's very simple. Bad deal, should have never been thought of. Somebody really messed up", Trump said Tuesday.
Mr Trump did not give his views on who was ultimately responsible.
During his visit to Saudi Arabia in May 2017, Trump signed an agreement with the Saudis for them to purchase Dollars 110 billion of United States weapons, although so far only USD 43 billion of that has been detailed.
Trump repeated the denials by Saudi Crown Prince Mohammed bin Salman that he knew of the plot before it was carried out. According to two intelligence sources, Mr Qahtani ran the killing by giving orders over Skype.
Erdogan told Turkish lawmakers that "Saudi Arabia has taken an important step by admitting the murder". In his speech to Turkey's parliament, Erdogan said the teams arrived in separate groups - two sets of three people and one group of nine.
The search of the vehicle in the auto park has been halted and will resume on Wednesday morning, the broadcaster said. It was not clear what was in the suitcases.
"Jamal Khashoggi's killing is a violently planned and a very complicated murder, which was being covered up", Omer Celik, AKP spokesman, said at the party's headquarters in Ankara on Monday. I think that's over a million jobs.
"I know that, from a certain standpoint, you could also say, 'Well, it doesn't matter, because it is a awful thing.' But we would be really hurting ourselves". The Saudi government says that Khashoggi died after a fistfight.
Saudi Arabia's Foreign Minister Adel al-Jubeir said on Tuesday the kingdom was committed to a thorough and complete investigation to get to the truth behind the killing of journalist Jamal Khashoggi in Turkey. He was told he would need to return later to collect the documents.
The officers had removed the hard drive from the security cameras in the consulate before inviting the journalist there, he added. "To cover up such savagery would hurt the human conscience", he said.
They say that the journalist was targeted inside the kingdom's consulate in Turkey and a body double was on hand to aid in a cover-up. "The American people want answers, and we will demand that those answers are forthcoming". Consulate personnel were given the day off.
MSB's popularity doesn't seem to be affected by accusations of masterminding the murder of dissident Saudi journalist, Jamal Khashoggi, with his appearance among the crowd in Riyadh on Tuesday causing a major stir.