Mr Chishti was paid £2,000 a month as an adviser to the King Faisal Center for Research and Islamic Studies from March 2016 until January 31 this year.
A man waits to enter Saudi Arabia's consulate in Istanbul, Friday, Oct. 19, 2018.
Trump also emphasized Riyadh's importance in countering regional rival Iran and the importance for American jobs of massive US arms sales to Saudi Arabia.
USA lawmakers have called on the U.S. to halt sales of arms to Saudi Arabia and to conduct an independent investigation into Khashoggi's death, saying that any investigation by the Saudis could not be trusted.
"As we learn more details of Khashoggi's disappearance, the United States must send a clear message that we will not condone such reprehensible behaviour that goes against our American values".
On the Saudi arrests, he added: "It's a big first step".
The public prosecutor said 18 people, all Saudi nationals, have been detained in connection to the probe.
Saudi Arabia also noted that the suspect tried "to hide what happened and to cover it up".
Saud Qahtani, a powerful adviser to Prince Mohammed, also was sacked.
Saudi critics said it was obvious the authorities didn't want to hand over Khashoggi's body as it would reveal how badly he was tortured.
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Australia were set a big target of 538 to win the second Test after some useful contributions from the Pakistan batting line-up saw them declare at 400/9.
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The exhausted travelers are mostly from Honduras, but migrants from other Central American countries have joined the caravan. The developments on Friday came as Mike Pompeo prepared to fly to Mexico to discuss migration with the country's officials .
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After walking him, Brewers manager Craig Counsell promptly replaced him with right-handed reliever Brandon Woodruff . The Brewers will counter with left-hander Wade Miley , who held the Dodgers scoreless over 5 2/3 innings in Game 2.
Members of the US Congress were far harsher about the announcement on Saudi state media, which said that Khashoggi died after his discussions at the consulate in Istanbul devolved into a fistfight.
Following the king's order, Al-Qahtani tweeted that he would remain a "loyal servant for my country forever".
A leaked surveillance photo published by the same paper on Thursday showed that a member of Prince Mohammed's entourage during several trips overseas had walked into the Saudi Consulate just before the writer disappeared.
The incident had threatened to create a diplomatic crisis with the US, which sees its alliance with Riyadh as the cornerstone of its Middle East policy, and Turkey, which has tenuous ties with Saudi Arabia.
Turkish crime scene investigators this week searched the Saudi Consulate building in Istanbul and the nearby residence of the Saudi consul general, and came out carrying bags and boxes.
Trump acknowledged Thursday that it "certainly looks" like Khashoggi is dead and threatened "very severe" consequences if the Saudis are found to have killed him.
Adam Schiff, ranking Democrat on the House intelligence committee, who on Friday night stated the obvious, that Saudi Arabia's claim that he was "killed while brawling with a team of more than a dozen dispatched from Saudi Arabia is not credible".
In Saudi Arabia, all eyes will be on what happens next.
The president is trying to defend the Saudi regime and specifically Mohammed bin Salman.
"The United States and the rest of the worldwide community must condemn the murder of Mr. Khashoggi and the use of diplomatic posts as torture chambers for rogue nations".
"Now the same government that lied to the world, claiming for weeks that it had no knowledge of Khashoggi's fate, expects us to believe he died in a fight", CPJ Executive Director Joel Simon said in a statement. "The impartiality of a Saudi investigation would remain in question".