To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Share Embed Share URL Video File Node URL Embed Code <iframe title="MRC TV video player" width="640" height="360" src="https://www.mrctv.org/embed/120000" allowfullscreen></iframe> CNN's Carol Costello asked why Republicans are questioning Defense Secretary nominee Chuck Hagel about Benghazi, "despite" all the previous testimonies and the letter from President Obama on the matter.