Some lawmakers have questioned whether the raid on Sept. 11, the 11th anniversary of the al Qaeda terror attack on the U.S., could have been avoided or at least mitigated.
Most of the hearings will center around decision-making at the Pentagon and the State Department, though some lawmakers are also lodging questions at the White House.
Republican Sen. Marco Rubio, who sits on the Senate's intelligence and foreign affairs committee, said he wants to know why the Obama administration delayed in acknowledging that the raid was a terrorist attack.
'What is real important to know is why did they wait so long... to publicly change their position on [the raid],' Rubio told reporters.
He said he wants to hear from Petraeus as well as Secretary of State Hillary Clinton over the next couple days.
Sen. Lindsey Graham, a Republican from South Carolina, said it is 'essential' that Petraeus testify.
'I don't see how in the world you can find out what happened in Benghazi before, during, and after the attack if General Petraeus doesn't testify,' he said on CBS.
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