Rep. Darrell Issa threw down the gauntlet to President Obama in a letter to the president that accuses him of being involved in the Fast and Furious operation. The Hill: Issa took issue with Obama's assertion of executive privilege over a cache of documents at the Department of Justice - including a February 2011 letter later withdrawn by the agency - that Issa believes includes information on Holder's role in Fast and Furious. "Either you or your most senior advisers were involved in managing Operation Fast and Furious and the fallout from it, including the false Feb. 4, 2011 letter...