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GOP leaders are coming under new pressure from conservatives to form a special committee to investigate the Benghazi attack.

Rep. Steve Stockman (R-Texas) is circulating a discharge petition to force a House vote on forming the panel, which would investigate events leading up to the terrorist attack last year on the U.S. consulate in Benghazi, as well as the Obama administration’s response.

Stockman on Tuesday will unveil a 60-foot-long scroll signed by 1,000 Special Forces veterans who support the committee. Supporters tout it as the largest petition ever presented to Congress, and Stockman plans to unroll it down the Capitol’s steps.

“The only way we’re going to get a clean and thorough investigation is by forcing a vote with a discharge petition,” Stockman said in announcing his petition last week.

If Stockman can get 218 House members to support his dischage petition, it would force a vote on the House floor.