Earlier, Turkish police Monday searched the Saudi consulate in Istanbul for the first time since journalist Jamal Khashoggi went missing, as US President Donald Trump floated the idea that "rogue killers" could be to blame for his disappearance.
President Trump, however, suggested Monday that "rogue killers" may be the reason for Khashoggi's disappearance.
Turkish officials say they fear a Saudi hit team killed Khashoggi, who has been missing almost two weeks.
SAUDI journalist Jamal Khashoggi disappeared nearly two weeks ago while on a visit to the Saudi Consulate in Istanbul.
"I don't think any of our government officials should be going and pretending it's business as usual until we know what's happened here", said Rubio, R-Fla.
Secretary of State Mike Pompeo will travel to Riyadh today, the State Department said, adding that 'the president has called for a prompt and open investigation'. Saudi Arabia is the world's top oil exporter, spends lavishly on Western arms and is a major Sunni Muslim ally. "But we want to find out what happened and he's got instructions to find out what happened".
The Saudis "have to be aware that if they move forward with the conference, the story will be 'nobody showed up, '" the source said.
Trump said he could not confirm such reports.
The case has provoked an global outcry against Saudi Arabia, the world's top oil exporter, with more media and business executives pulling out of a planned investment conference there this month.
One security official told The New York Times that a squad of 15 Saudi men arrived in Istanbul and killed Khashoggi.
Saudi officials have called all the allegations "baseless", but have offered no evidence the journalist left the consulate.
A team of cleaners entered the Saudi consulate in Istanbul today - just hours before Turkish officials will be escorted around by Saudis in a joint inspection over the disappearance.
Khashoggi, who recently has been living in Virginia and writing columns for The Washington Post, hasn't been seen since October 2, when he entered the Saudi Consulate to handle paperwork for his upcoming marriage. "And this is very important to get to the bottom of it". USA intelligence officials have reported they are certain the interference took place in an effort to hurt Hillary Clinton's campaign.
A Turkish diplomatic source said it was expected that the search, to be conducted jointly with Saudi authorities, would "take place towards the evening".
Gen. Jack Keane (Ret.) on the disappearance of Saudi journalist Jamal Khashoggi.
Meanwhile, on 14 October also had a telephone conversation with Saudi king Salman and Turkish President Recep Tayyip Erdogan.
But he has said repeatedly that he does not want to halt a proposed $110 billion arms sale to Saudi Arabia - as some in Congress have said he should - because it would harm the USA economically.
The case has caused friction between Saudi Arabia and Turkey, which repeatedly accused the Saudis of failing to cooperate with their investigation.
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