Turkish officials have said they believe the Saudi writer and government critic was killed inside his country's consulate in Istanbul after he visited the mission to obtain a document required to marry his Turkish fiancee.
The Post, a newspaper to which Khashoggi contributed, cited unnamed U.S. officials as saying that Saudi officials had been heard discussing a plan to lure Khashoggi from the USA state of Virginia, where he resided, and detain him. Saudi Arabia has sent its own security team to work with Turkish counterparts and intends to "chase every lead to uncover the truth behind his disappearance", he said.
The same source said the Saudis hoped to "lure" Khashoggi to Saudi Arabia "and lay hands on him there".
"It's a very sad situation, it's a very bad situation and we want to get to the bottom of it", said the president.
Secretary of State Mike Pompeo also spoke with the crown prince "to reiterate the United States request for information", Sanders said.
On Wednesday, Corker told reporters that the Senate would "take some action ourselves" over Khashoggi's disappearance. Sabah on Wednesday revealed the identities of what it called a "mysterious" 15-member "assassination squad" who were allegedly involved in Saudi writer and government critic Jamal Khashoggi's disappearance. But while he said he had spoken to Saudi officials-including possibly King Salman himself-Trump made no indication he pressed them for answers and seemed bewildered by the idea that he could possibly find out more.
Politicians in the United States, Riyadh's main ally, have warned that any harm done to the Washington Post contributor will jeopardize America's relations with the world's largest oil exporter.
Corker described his talks with Khalid bin Salman, the Saudi ambassador to the USA, as "not a great conversation", and asked to show him video footage of him leaving the consulate.
Turkish NTV also broadcast security camera footage on Wednesday that it said showed the men arriving at the airport and checking into a hotel, as well as videos of what it said was a van arriving at the consul general's residence two hours after Khashoggi entered the consulate, about 250 meters (820 ft) away.
Khashoggi, a Saudi journalist critical of the ruling royal family, was last seen entering the Saudi consulate in Istanbul, Turkey, on October 2. The $500 billion business and industrial NEOM project is the centerpiece of the kingdom's plan for a modern, dynamic Saudi Arabia. He wrote columns for the Washington Post and the Guardian. A picture of Khashoggi entering the consulate shows the time-stamp 13:14.
In an opinion piece for the Washington Post, Hatice Cengiz called on President Trump and the first lady to "help shed light on Jamal's disappearance". "We are demanding everything".
Turkey's Foreign Ministry said Tuesday authorities would search the Saudi consulate, but there have been no details about when such a search would take place.
Local media on Tuesday reported on the possibility that Khashoggi was kidnapped and taken aboard one of the private planes.