(CBSNEWS) — The closer we get to the election, the harder Republicans in Congress are pushing for answers to a big question: What really happened in the attack on the U.S. Consulate in Benghazi, Libya last month that killed the U.S. Ambassador Christopher Stevens and three other Americans?

Some lawmakers are asking why U.S. military help from outside Libya didn’t arrive as terrorists battered more than 30 Americans over the course of more than seven hours. The assault was launched by an armed mob of dozens that torched buildings and used rocket propelled grenades, mortars and AK-47 rifles.

CBS News has been told that, hours after the attack began, an unmanned Predator drone was sent over the U.S. mission in Benghazi, and that the drone and other reconnaissance aircraft apparently observed the final hours of the protracted battle.

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