When asked by a friendly lawmaker how it felt to be accused of contributing to the deaths of four Americans, she spoke in a soft tone about the emotional toll of the 2012 attacks. [...] when the committee's Republican chairman and top Democratic member heatedly argued about making public the panel's earlier private hearings, Clinton sat back with an amused smile on her face for several minutes. To be sure, Clinton was sharply challenged by GOP lawmakers on a range of issues, from requests for additional security at the Benghazi compound that went unfulfilled to her frequent email exchanges about Libya with Sidney Blumenthal, a longtime Clinton friend who had no role at the State Department. Ohio Rep.