On Sunday, Turkish President Recep Tayyip Erdogan said he will make a statement on Khashoggi's killing on Tuesday during his party's group meeting at the parliament. The kingdom later changed its story, claiming Saturday that the 59-year-old writer had died in a "fistfight", a contention that drew global skepticism.
The Saudis now say Khashoggi was killed in a "fistfight" inside the consulate and that 18 Saudis had been arrested in connection with the death.
Germany is the fourth-biggest exporter of weapons to Saudi Arabia, behind the US, Britain and France.
US President Donald Trump accused Saudi Arabia of lying about the killing, his strongest comments to date on the affair, as pressure built Sunday on the administration to identify and punish those responsible. On Sunday, Saudi foreign minister Adel al-Jubeir said in an interview with Fox News that "individuals".
Asked how the Prince responded, Mr Kushner said: "We'll see".
Celik pointed to CCTV footage published by CNN on Monday, which the American broadcaster claimed showed one of the Saudi officials acting as a body double for Khashoggi and leaving the consulate.
After a phone call with Crown Prince M. bin Salman Trump also said "there's no reason" for Saudi Arabia's request for a month to complete an investigation into Khashoggi, adding "that's a long time".
However, if the Saudis did use a body double, obviously that would refute the notion that his killing was an accident.
Foreign Affairs Minister Chrystia Freeland condemned the murder of Khashoggi on Monday, saying the various Saudi explanations for his death lacked credibility and consistency. He initially said he believed the Saudi account.
"I think the President is focused on what's good for America", Kushner said.
Madani was among the 15 suspects Turkish officials say were dispatched from Saudi Arabia to Istanbul to confront Khashoggi at the consulate.
Maher Abdulaziz Mutrib, an intelligence officer who accompanied MBS on trips overseas, is thought to have carried the body parts in a large bag and left Turkey on a private jet that departed at 18:20 local time on October 2, the day of Khashoggi's death, the sources told Middle East Eye. "His blood should lead to the prosecution of the perpetrators of this crime, who are the same perpetrators of the crime against millions of people in Yemen - that is the Saudi kingdom", said Karman, journalist and a leader of the Arab Spring in Yemen in 2011.
He said Saudi agents "did this out of the scope of their authority", calling it "a rogue operation".
Trump was quoted in the Post over the weekend as playing down Kushner's relations with Saudi Arabia and the crown prince.
All this came on the eve of Prince Mohammed's high-profile investment summit in Riyadh, which has seen a raft of the world's top business leaders decline to attend over the slaying of the writer for The Washington Post.