Former Secretary of State Hillary Clinton said she is willing to testify to the House committee investigating the 2012 terrorist attacks in Benghazi, the top Democrat on the panel told reporters Tuesday. Rep. Elijah Cummings of Georgia said Clinton agreed to appear again before the panel as early as December when he asked her in September at the request of Republican committee chairman Trey Gowdy. Clinton has not been formally asked to testify, according to a Democratic aide, but Gowdy said the panel would need additional documents from the State Department before he would call her to appear. The State Department has sent the panel more than 40,000 documents, which included 15,000 files never previously sent to Congress. Clinton has previously testified before the House and Senate panels on the attacks on the U.S. consulate in Benghazi, which left four Americans dead including Ambassador Chris Stevens.