President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE said Monday he's sending Secretary of State Mike Pompeo Michael (Mike) Richard PompeoTreasury sanctions individuals, groups tied to Russian malign influence activities Navalny released from hospital after suspected poisoning Overnight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers MORE to meet with King Salman of Saudi Arabia after the king denied knowing about the disappearance of journalist Jamal Khashoggi.

"Just spoke to the King of Saudi Arabia who denies any knowledge of whatever may have happened 'to our Saudi Arabian citizen,' " Trump wrote in a tweet, referring to Khashoggi without using his name.

"He said that they are working closely with Turkey to find answer. I am immediately sending our Secretary of State to meet with King!" Trump added.

Just spoke to the King of Saudi Arabia who denies any knowledge of whatever may have happened “to our Saudi Arabian citizen.” He said that they are working closely with Turkey to find answer. I am immediately sending our Secretary of State to meet with King! — Donald J. Trump (@realDonaldTrump) October 15, 2018

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Trump told reporters outside the White House a short time later that Pompeo was departing "within an hour or so," and could visit Turkey as part of his trip as well.

Trump's phone call with King Salman, 82, comes three days after the president said he intended to speak with the king "very soon" after Khashoggi's disappearance. Though Trump spoke with the king, much of the focus in Khashoggi's disappearance has been on Crown Prince Mohammed bin Salman, the heir apparent to the throne who holds significant power in the country.

Khashoggi, a Washington Post columnist and Saudi dissident, first went missing two weeks ago. He was last seen entering the Saudi consulate in Istanbul and was not seen leaving.

Turkish officials have said they have audio and video that proves Khashoggi was killed at the consulate. Senators on Sunday indicated that it's looking increasingly likely that Khashoggi was murdered there.

Saudi Arabian officials have said they do not know what happened to Khashoggi.

Turkey and Saudi Arabia formed a joint working group to investigate the matter. CNN reported on Monday that Saudi Arabia has granted investigators permission to search the consulate in Istanbul.

Trump warned in a "60 Minutes" interview broadcast Sunday that Saudi Arabia would face "severe punishment" if it's proven the country was involved in Khashoggi's disappearance, but was reluctant to alter arms deals between the U.S. and the Saudis.

Khashoggi is an American resident living in self-imposed exile from Saudi Arabia, as he has been a frequent critic of the country's leadership. On Monday and in Oval Office remarks last week, Trump has made a point to note that Khashoggi is not an American citizen.

While Trump has insisted the U.S. has yet to determine what happened to Khashoggi, lawmakers have been united in their outrage over his disappearance and vowed Saudi Arabia would face consequences in the matter. Senators invoked sanctions legislation last week to compel Trump to conduct an investigation into the issue.

Sens. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.), Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP MORE (R-Fla.) and Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.) have all said in recent days that Saudi officials' denials don't hold up under scrutiny, particularly their claim that the cameras at the consulate did not record video around the time Khashoggi was last seen.

"So, the only two things that could have happened is, he's alive and somehow still in there, or he's dead and the Saudis are the ones who did it," Rubio said. "There's no other explanation for it, because if there was video of him leaving, they would have shown it by now."

"I believe the Trump administration will do something," Rubio added. "The president has said that. But, if he doesn't, Congress will. That, I can tell you with 100 percent certainty."

Treasury Secretary Steven Mnuchin Steven Terner MnuchinHillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars Treasury: Trump's payroll tax deferral won't hurt Social Security Treasury sanctions individuals, groups tied to Russian malign influence activities MORE is scheduled to travel to Saudi Arabia next week for an economic summit. The White House has said Mnuchin is monitoring developments in Khashoggi's disappearance but still plans to attend.