The leaders of the House Homeland Security Committee subpoenaed the owner of online message board 8chan on Wednesday for testimony on the proliferation of harmful content on social media sites, a move that comes as the platform faces scrutiny for serving as a haven for extremists.

The subpoena issued by committee Chairman Bennie Thompson, a Democrat from Mississippi, and ranking member Mike Rogers, a Republican from Alabama, calls for Jim Watkins, owner of the online message board, to appear before the panel Sept. 5.

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