House chairman complains about Pentagon response on Benghazi
Senior military officials have said limited intelligence about what was transpiring the night of the attacks and the absence of forces in close proximity to Libya hampered the response.
Republicans say the Obama administration has dragged its feet, failing to produce needed documents or interview subjects, and delaying a final report in the twin assaults.
A senior Pentagon official has expressed frustration with the Benghazi panel, citing a "crescendo" of costly, duplicative and unnecessary requests, including a few based on claims made on Facebook or talk radio.