An Indiana Republican is calling on 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 to withdraw his planned participation in a finance conference in Riyadh, following the disappearance of Washington Post journalist Jamal Khashoggi.

Rep. Jim Banks on Friday said Mnuchin should not participate in the Future Investment Initiative conference after the secretary told CNBC earlier in the day that he is "concerned about what is the status of Mr. Khashoggi" but still plans on attending the meeting.

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"Secretary Mnuchin should cancel his travel to Saudi Arabia later this month until the world receives answers about what happened to journalist Jamal Khashoggi at the Saudi consulate in Istanbul," the Indiana Republican tweeted Friday morning.

Secretary Mnuchin should cancel his travel to Saudi Arabia later this month until the world receives answers about what happened to journalist Jamal Khashoggi at the Saudi consulate in Istanbul. https://t.co/Yg7TGacEmn — Jim Banks (@RepJimBanks) October 12, 2018

Khashoggi, an opinion writer for the Washington Post who has been critical of the Saudi government, disappeared after entering the Saudi consulate in Istanbul on Oct. 2 to obtain a marriage-related document for his fiancee.

His disappearance has raised diplomatic tensions between the U.S. and Saudi Arabia, with prominent U.S. media organizations, journalists and business executives announcing they will no longer participate in the Future Investment Initiative amid reports that Turkish officials have uncovered evidence that Khashoggi was murder by Saudis at the instruction of the Saudi government.

The New York Times, The Economist and Uber CEO Dara Khosrowshahi have pulled out of the Riyadh conference, while other organizations such as CNN say they are evaluating whether to attend.

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 indicated this week that his administration will look into Khashoggi's disappearance, and has said that if there's evidence that the journalist was murder by the Saudis it would threaten U.S.-Saudi ties.

"I have to find out what happened. I mean, I do have to find out. And we're probably getting closer than you might think. But I have to find out what happened," the president said in an interview with Fox News.