“It has been 48 days since the Sept. 11, 2012, terrorist attack on our U.S. consulate and the CIA annex in Benghazi, Libya,” Johanns wrote. “It is unacceptable that you have yet to provide a clear accounting of the events and decisions that led to the brutal murders of four brave Americans.”

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U.S. Ambassador to Libya Christopher Stevens and three other Americans were killed in Benghazi during the attack. Johanns said releasing a detailed timeline would put concerns to rest.

The most recent news report that Republicans are using to criticize the administration is that Panetta refused to deploy troops to help those at the consulate.

“If it is true that requests for help during the attack were denied, such denials would be outrageous and inexcusable,” the letter stated. “American blood was shed at the hands of terrorists. Brave men who dedicated themselves to service and believed their country would stand behind them were left unprotected and brutally murdered. Americans deserve truthful, timely and complete answers. The families of these American heroes deserve answers.”

Last week, Senate Intelligence Committee Chairwoman Dianne FeinsteinDianne FeinsteinDems get it wrong: 'Originalism' is mainstream, even for liberal judges Human rights leaders warn against confirming Gorsuch Feinstein sees slipping support among California voters: poll MORE (D-Calif.) announced that she would hold a hearing on the attack in Benghazi after the election. The House has already started an investigation.

Johanns said, “Americans suspect a full accounting of the facts will be delayed until the election is over and this administration would be very well-served to prove them wrong.”

Earlier this month, Secretary of State Hillary ClintonHillary Rodham ClintonDemocrats step up calls that Russian hack was act of war Comet Ping Pong shooter pleads guilty Time for 'J. Edgar' Comey to take his leave MORE said she'd take responsibility for the lack of security during the attack in order "to avoid some kind of political 'gotcha' " for the administration. 

In an interview with MSNBC aired last week, Obama vowed that he would find the people responsible and urged lawmakers to allow the administration to conduct a full probe into the attack, acknowledging that as commander in chief, he was “ultimately” responsible for the security of U.S. diplomats.