“Americans deserve to know what, if anything, you, as the owner and operator, are doing to address the proliferation of extremist content on 8chan,” said the letter, signed by chairman Rep. Bennie G. Thompson (D-Miss.) and Rep. Mike D. Rogers (Ala.), the committee’s top Republican. In a separate statement, the committee said lawmakers wanted to tackle “the very real and persistent threat from domestic terrorism.”

The anything-goes message board remained offline Tuesday following major decisions by two tech companies to stop working with it.

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It was further pummeled when Epik, a technology firm that had vowed to step in and provide assistance to bring the site online, issued a surprise reversal, citing “concern of inadequate enforcement and the elevated possibility of violent radicalization on the platform.”

Watkins did not immediately respond to requests for comment. Early Tuesday, he had posted a video to YouTube defending the site as “a peacefully assembled group of people talking.”

The site has become infamous for its role in the fatal attacks in El Paso this weekend and earlier this year at mosques in Christchurch, New Zealand, and a San Diego-area synagogue. Before each shooting, authorities say, the suspects allegedly used the board to share hateful screeds explaining and promoting the attacks.

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The board is almost entirely unmoderated, and its posters have routinely used the site to traffic in threats of violence and online hate. The site’s founder, Fredrick Brennan, told The Washington Post on Sunday that the site was a haven for domestic terrorists and should be shut down for good.

On Tuesday, Brennan showed little sympathy for Watkins. “Jim totally deserves this; he wasn’t willing to even pretend to care or do the minimum after shootings to stop users inciting further violence," he said. "Given he hasn’t acted in good faith throughout this crisis, it’s ultimately a good thing for everyone, even 8chan’s own users, that 8chan is struggling to come back online.”

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Epik, based outside Redmond, Wash., had said Monday that it would provide critical services to 8chan after its previous partner, the digital security firm Cloudflare, terminated its work with the site, calling it a “lawless ... cesspool of hate."