The U.S. Department of State said it cannot confirm whether six planes holding American citizens are being held hostage by the Taliban in a northern Afghanistan city. Rep. Michael McCaul (R-Texas), the top Republican on the House Foreign Affairs Committee, told Fox News on Sunday that the planes are being “held hostage for demands right now,” although he did not provide many details. A spokesperson for the State Department, in response, said it doesn’t have the ability to confirm the veracity of McCaul’s claim, noting that it has no information on the ground in Afghanistan after U.S. Embassy staff and the U.S. military departed the country last month. Because the United States has no personnel in the country or air assets, the agency doesn’t “have a reliable means to confirm the basic details of charter flights, including who may be organizing them, the number of U.S. citizens and other priority …