Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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By Jake Tapper
Republicans on the House Committee on Oversight and Government Reform have located individuals who have evidence about the September 11, 2012 attack on the U.S. consulate in Benghazi Libya - ones whom they describe as whistleblowers - and are asking federal agencies to allow the witnesses to be able to share classified information with their attorneys without fear of retaliation.
In letters to Mary McLeod, the principal deputy legal adviser in the Office of the Legal Adviser at the U.S. State Department; Stephen Preston, General Counsel for the Central Intelligence Agency; and Robert Taylor, acting General Counsel at the Pentagon, Congressman Darrell Issa, R-California, the chairman of the House committee on Oversight and Government Reform, requests clearance for attorneys "to possess and discuss Top Secret and Sensitive Compartmented Information (SCI)" so that "attorneys representing witnesses in this matter can properly represent their clients and so witnesses can lawfully disclose sensitive or classified information to their attorneys."
Issa also requested from the different agencies the rules and regulations that would be relevant to allowing these witnesses to talk to their lawyers and ultimately to testify to Congress.
The sensitive nature of the work these State Department, CIA, and military officials were doing in Libya has been a hindrance to both congressional and journalistic investigations into what happened in the attack, which left four Americans dead, including the U.S. Ambassador, Chris Stevens.
Reconstructing the Boston bombs could be key to the manhunt. Agents at the FBI lab in Quanitco, Virginia, are trying to rebuild the bombs that killed three and maimed so many at the Boston Marathon. They are looking for the virtual fingerprints of a terrorist.
Investigators found the twisted top of a pressure cooker on a roof, shredded pieces of what could be a backpack, and metal ball bearings. But whatever is missing could be key.
CNN's Tom Foreman is in the virtual studio with a look at the police work that could track down those responsible.
Letters sent to President Obama and Sen. Roger Wicker, R-Mississippi, have initially tested positive for ricin, a deadly poison. Suspicious packages forced evacuations at Senate offices earlier today.
"Ricin is a byproduct of the caster beans," said Leonard Cole, a terror medicine expert with Rutgers University. When getting caster oil from caster beans, one of the byproducts is ricin.
"When ricin is purified ... and produced in a light powder form that can float and be inhaled, it can be highly dangerous, lethal," said Cole.
"One or two grains of salt would be the equivalent size of the amount of ricin that would be lethal to a human being, if a person ingests or inhales it," said Cole.
CNN's Dana Bash explains how the White House is reacting after a letter containing poison was sent to the president.