Former Attorney General Dick Thornburgh, shown here in 2010, is one former Justice Department official supporting the case of an Albanian witness asking for government protection. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

Attorney General Eric Holder Nicholas Kamm/AFP/Getty Images hide caption

itoggle caption Nicholas Kamm/AFP/Getty Images

The Securities and Exchange Commission headquarters in Washington. AP hide caption

itoggle caption AP

This image provided by the Drug Enforcement Administration shows Russian arms trafficking suspect Viktor Bout in U.S. custody after being extradited and flown from Bangkok to New York to face terrorism charges. DEA/AP hide caption

itoggle caption DEA/AP

A shortage of a key drug for lethal injections has slowed the pace of executions. Nate Jenkins/AP hide caption

itoggle caption Nate Jenkins/AP

A man is pulled off a commuter train at the Civic Center BART station on July 11 in San Francisco after climbing on top of it during a protest against the July 3 shooting by transit police of Charles Blair Hill. On Thursday, BART officials blocked cell service in some stations to prevent another protest. Eric Risberg/AP hide caption

itoggle caption Eric Risberg/AP

Justice Sonia Sotomayor, shown with President Obama in this file photo, became the first Hispanic Supreme Court justice during the Obama administration, one of a number of judicial diversity milestones the White House has made. Jewel Samad/AFP/Getty Images hide caption

itoggle caption Jewel Samad/AFP/Getty Images

A photo taken in January shows part of a cache of seized weapons displayed at a news conference in Phoenix. In July, the Justice Department announced new rules requiring gun dealers to report multiple sales of semi-automatic rifles. Matt York/AP hide caption

itoggle caption Matt York/AP

President Lyndon B. Johnson signs the Voting Rights Act into law. One provision of the law is still controversial. AP hide caption

itoggle caption AP

U.S. Sen. Charles Grassley (R-IA) has warned the Justice Department not to punish insiders who talk to Congress about the "Fast and Furious" operation. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP