While the explanation has been dismissed by many U.S. officials and members of Congress as not credible, Trump withheld judgment on Monday until top U.S. intelligence officials could return from a trip to the region. The CIA did not return a request for comment, but sources told ABC News that director Gina Haspel had traveled to Turkey on Monday.
"We have people over in Saudi Arabia now. We have top intelligence people in Turkey, and we're going to see what we have. I'll know a lot tomorrow," he said, adding he had spoken to Crown Prince Mohammed bin Salman again, the young leader said to be the real power behind the throne. He's suspected to be the one responsible for launching the plot against Khashoggi, although Saudi Arabia strongly denies that.
The president would not say whether he believes those denials in an interview with USA Today, but added he does still think it was "a plot gone awry."
The stiffer tone from Trump, however, was softened by his continued defense of U.S.-Saudi economic relations and his expressed desire to not mess with it.
"I don't want to lose all of that investment that's being made in our country. I don't want to lose a million jobs. I don't want to lose a $110 billion in terms of investment," he said.
During his visit to Saudi Arabia in May 2017, Trump signed an agreement with the Saudis for them to purchase $110 billion of U.S. weapons, although so far only $43 billion of that has been detailed.
Trump's son-in-law and senior adviser, Jared Kushner, who has a close relationship with the Crown Prince, issued the same caution Monday, saying the administration was "in the fact-finding phase" still.
"We're obviously getting as many facts as we can from the different places, and then we'll determine which facts are credible, and then after that the president and the secretary of state will make a determination as to what we deem to be credible and what actions we think we should take," he said during a forum hosted by CNN.
But he too stressed being "focused on what's good for America, what are our strategic interests."
To that end, Treasury Secretary Steven Mnuchin met with the Crown Prince Monday. While he canceled his participation in a major Saudi investment forum, he still flew to the capital Riyadh to discuss "combating terrorist financing, implementing Iran sanctions, Saudi economic issues and the Khashoggi investigation," according to his spokesperson Tony Sayegh.
American diplomacy came as Turkey ramped up its investigation Monday, searching a car that belongs to the Saudi consulate, but was found in an Istanbul parking lot. CNN also aired surveillance video that Turkish authorities said showed one of the key suspects dressed in Khashoggi's clothes leaving the back of the consulate shortly after he was killed. The suspect is reportedly now in Saudi custody.
It was yet another report citing anonymous Turkish authorities who have consistently leaked details of the investigation to the press to pressure Saudi Arabia and the U.S. But on Tuesday that will change as Turkish President Recep Tayyip Erdogan goes on the record with a major address before parliament.
In the first official comments from the Turkish government, Erdogan said he will reveal the details of Turkey's investigation into the plot against Khashoggi: "It will be revealed in full nakedness."
Erdogan's spokesperson Ibrahim Kalin said Monday that while Turkey's "ultimate aim, duty, and responsibility is to enlighten the incident in all its parts," Saudi Arabia remains "an important country for us. It is a brotherly and friendly country... Of course, we would not want this to be harmed."
But in what could be a tease of Erdogan's speech, his political party's spokesperson was much tougher and called Saudi Arabia's operation "a brutally planned [killing] and efforts were made to cover it up. When we look at it through this frame, it's a very complicated murder."
ABC News's Ben Gittleson contributed to this report.