A conservative advocacy group on Friday called on the Justice Department to investigate a weekly prayer session on Capitol Hill that Muslims with terrorist ties have been participating in since the Sept. 11 terrorist attacks.

The American Center for Law and Justice, founded by the Rev. Pat Robertson, issued the demand one day after FoxNews.com revealed that notorious Al Qaeda cleric Anwar al-Awlaki was among the controversial figures who has attended the weekly Friday Jummah prayers hosted by the Congressional Muslims Staff Association during the Clinton, Bush and Obama administrations.

The group held prayers informally for about eight years before gaining official status in 2006 under the sponsorship of Rep. Keith Ellison, D-Minn., one of two Muslims currently serving in Congress.

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