Senate Commerce Committee Chairman Sen. Roger Wicker Roger Frederick WickerThe Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-Miss.) said he was “extremely disappointed” 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 declined to participate in an upcoming hearing on online violence and extremism, Politico reported Friday.

In the Sept. 4 letter, Wicker reportedly urged Zuckerberg to “personally participate” in the congressional hearing, according to Politico.

“As a dominant social networking platform, Facebook has a significant role in the communications marketplace,” Wicker wrote. “Your direct engagement as the chief executive officer of Facebook on this issue will be invaluable to our efforts to protect communities and enhance public safety.”

Wicker reportedly indicated in the letter that he and Zuckerberg had already talked about how Facebook is working to remove extremist content from its platform, Politico reported.

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Both Facebook and Wicker’s office did not immediately respond to requests for comment from The Hill.

The letter reportedly said Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellDemocratic senator to party: 'A little message discipline wouldn't kill us' House to vote on resolution affirming peaceful transition of power Republican lawyers brush off Trump's election comments MORE (R-Ky.) had called on the Senate Commerce Committee to join a greater effort to address violence in the aftermath of multiple deadly mass shootings in recent weeks.

In the case of a shooting last month in El Paso, Texas, the alleged gunman confessed to targeting “Mexicans” and allegedly wrote a white nationalist manifesto, which was posted on anonymous messaging board 8chan, before fatally shooting 22 people and injuring dozens of others.

The owner of 8chan — which has been tied to three mass shootings by alleged white supremacists this year alone — testified on Capitol Hill on Thursday and defended his website to House staffers behind closed doors.

In June, Facebook, Twitter and Google defended their efforts to combat extremist content and misinformation online before House lawmakers, who reflected a dissatisfaction with the tech giants' plans.