In an essay in the Washington Post on Tuesday, Cengiz implored the president and Melania Trump to "help shed light on Jamal's disappearance".
President Donald Trump has expressed reservations over calls to withhold further us arms sales to Saudi Arabia as the USA looks into the fate of a Saudi writer missing and feared murdered by his own government.
Host Brian Kilmeade pressed Trump on what Khashoggi's disappearance will do to U.S. -Saudi relations. Khashoggi contributed columns to the Post, including some critical of Crown Prince Mohammed bin Salman.
Earlier Wednesday, Turkish media published surveillance footage of the men Ankara believes to have been part of the "assassination squad".
A pro-government Turkish newspaper published an account of a team of Saudis who flew to Istambul around the time of the disappearance.
Mr Erdogan has previously challenged Saudi Arabia to provide proof of its version of events - that Mr Khashoggi, a prominent critic of the Saudi monarchy, had left the consulate "after a few minutes or one hour". Turkey also requested permission to search the consulate building.
The Hurriyet newspaper and other media alleged that the consulate's 28 local staff were given the day off because a "diplomats' meeting" would be held there.
The Magnitsky Act is named for Sergei Magnitsky, a Russian lawyer who died in a Moscow prison after he reported tax fraud involving government officials. The 15 men reportedly left Turkey that same evening. "Although this incident could potentially fuel a political crisis between the two nations, let us not lose sight of the human aspect of what happened".
A Saudi Arabian flag flies over the Saudi Arabian consulate in Istanbul on October 10.
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"The Saudis have a lot of explaining to do because all indications are that they have been involved at minimum with his disappearance", Corker told The Associated Press.
'We want to see what's going on. "And they should be cooperating with us". "We're demanding everything", Mr Trump said when asked if he was demanding information from the Saudis.
Khashoggi, who had been living in self-imposed exile for the past year, vanished on October 2 after he entered the consulate to obtain a document. But Trump is expressing reservations over calls to withhold further USA arms sales to Saudi Arabia.
"If it turns out to be what we all think it is today but don't know, there will have to be significant sanctions placed at the highest levels", Corker said.
The country's ambasador to the US, Prince Khaled bin Salman al-Saud - brother of Crown Prince Mohammed bin Salman - described the accusations as "completely false and baseless".
"We're probably getting closer than you might think", he added.
The Kentucky Republican said he hopes Trump will support stronger measures against Saudi Arabia "if there is any evidence they killed this journalist". The administration also relies on Saudi support for its Middle East agenda to counter Iranian influence, fight extremism and support an expected peace plan between Israel and the Palestinians.
Khashoggi went to the consulate to take care of some paperwork for his upcoming marriage to a Turkish national. His Turkish fiancee waited outside.
The worldwide implications of Mr Khashoggi's disappearance deepened after the "Washington Post" reported that U.S. intelligence was aware the Saudi government was planning to kidnap the journalist.
USA officials have not confirmed Turkish claims that Khashoggi, a United States resident and one of the more outspoken critics of the regime of King Salman and his son Prince Mohammed, had been lured to the consulate and murdered by a team of 15 government operatives sent by Riyadh to Istanbul.