A Senate Democrat is asking major tech companies to investigate Saudi propaganda efforts on their platforms following reports of social media operations promoting the country’s talking points in the wake of the death of journalist Jamal Khashoggi.

Sen. Richard Blumenthal (D-Conn.) sent letters to Facebook, Google, Reddit and Twitter on Monday asking them to look into the matter as well as asking them to look into whether Saudi Arabia had employed social media tactics to boost then-candidate Trump during the 2016 presidential campaign.

“President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE’s vigorous defense of the Saudi government following the murder of Jamal Khashoggi raises questions about his ties, financial and otherwise, to Saudi Arabia,” Blumenthal wrote in his letters. “One such question is to what extent the Saudis provided assistance to the Trump campaign, including previously-reported proposals to manipulate voters through social media and online platforms.”

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The senator pointed to media reports tying both the Trump campaign and the Saudi government to the Psy-Group, an Israeli firm specializing in intelligence and public influence campaigns.

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According to an earlier Times report, Saudi Arabia paid the firm’s founder up to $2 million following the 2016 election for unknown reasons.

Blumenthal asked each company about the Psy-Group and other firms affiliated with its founder, Joel Zamel, and if they had purchased advertisements or used fake accounts on their platforms.

He also asked the companies if they had noticed any influence operations surrounding the death of Khashoggi, which the Saudis say happened during a fight within the Saudi consulate in Turkey.

“Has Facebook investigated reports of inauthentic accounts, “fake news,” or other fraudulent activities promoting pro-Saudi positions, including with respect to the murder of Khashoggi?” Blumenthal wrote to Facebook CEO Mark Zuckerberg Mark Elliot ZuckerbergHillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Conservative groups seek to block Facebook election grants in four swing states: report Facebook critics launch alternative oversight board MORE. “If so, has it made a determination regarding the source and nature of these influence campaigns, and will it disclose such findings?”

A Facebook spokesman said the company has received Blumenthal’s letter and is reviewing it. Twitter, Reddit and Google did not immediately respond when asked for comment.