The United States cannot stop Iranian oil exports by imposing sanctions on Tehran, Iran’s oil minister said on Tuesday, warning that such restrictions will ensure the market remains volatile.

Twenty-one Saudis will have their U.S. visas revoked or be made ineligible for U.S. visas over the killing of journalist Jamal Khashoggi.

He ran social media for Saudi Arabia’s crown prince. He masterminded the arrest of hundreds of his country’s elite. He detained a Lebanese prime minister. And, according to two intelligence sources, he ran journalist Jamal Khashoggi’s brutal killing at the Saudi consulate in Istanbul by giving orders over Skype.

Britain said questions remained over the killing of journalist Jamal Khashoggi, and only Saudi Arabia could provide answers to them.

President Donald Trump said Saudi authorities staged the “worst cover-up ever” in the killing of prominent journalist Jamal Khashoggi this month, as the United States vowed to revoke the visas of some of those believed to be responsible.

“Intelligence and security institutions have evidence showing the murder was planned,” Erdogan told members of his AK Party in parliament.

Iranian oil output cannot be replaced by other oil producing countries if Tehran is hit by U.S. sanctions in November, Iranian Oil Minister Bijan Zanganeh told the Ministry's website SHANA on Monday .

Germany's foreign ministry will ask Saudi Arabia's ambassador to join a meeting at the ministry to discuss fallout from the killing of Saudi journalist Jamal Khashoggi, a ministry spokeswoman said.

Germany wants other European Union member states to follow its example in stopping arms exports to Saudi Arabia as long as uncertainty remains over the killing of journalist Jamal Khashoggi, Economy Minister Peter Altmaier said on Monday.

Five Turkish employees of the Saudi consulate in Istanbul are giving statements as witnesses under an investigation into the killing of Saudi journalist Jamal Khashoggi, Turkish broadcaster NTV said on Monday.

CIA Director Gina Haspel was travelling to Turkey on Monday to help investigate the death of Saudi journalist Jamal Khashoggi, two sources familiar with the matter said, as security agencies examined what role Saudi Crown Prince Mohammed bin Salman may have played in the case.

Turkish authorities were prevented from searching a parked Saudi diplomatic car in Istanbul on Monday because they were not given permission from the consulate, private broadcaster NTV said.

German Chancellor Angela Merkel on Monday called the killing of journalist Jamal Khashoggi at the Saudi consulate in Istanbul a “monstrosity” and vowed to halt all German arms exports to Riyadh until the case is cleared up.

France declined to say on Monday if it might suspend weapons sales to Saudi Arabia, after Germany called on others to follow its example until the truth about Saudi journalist Jamal Khashoggi's murder is established.

British foreign minister Jeremy Hunt said on Monday it was not credible for Saudi authorities to claim that journalist Jamal Khashoggi died in a fight.

The Saudi novelist, Abdo Khal, retracted his previous positions regarding the circumstances of journalist Jamal Khashoggi’s death.

Britain said it was considering the “next steps” after Saudi Arabia acknowledged for the first time that the missing journalist Jamal Khashoggi was killed at its consulate in Turkey.

US President Donald Trump said on Saturday that he is not satisfied with Saudi Arabia’s explanation for the circumstances around the killing of journalist.

German Chancellor Angela Merkel said that the Saudi explanation of the circumstances of journalist Jamal Khashoggi’s death was “insufficient”.

So grave is the fallout from the disappearance of Saudi journalist Jamal Khashoggi that King Salman has felt compelled to intervene, five sources with links to the Saudi royal family said.