Hillary Clinton at a book signing in New York. The former secretary of state has said that Benghazi joins a long list of tragedies during administrations of both parties. Bebeto Matthews/AP hide caption

itoggle caption Bebeto Matthews/AP

Bob and Jani Bergdahl, the parents of freed American soldier Bowe Bergdahl, with President Obama at the White House on Saturday. The controversy over Bergdahl's release could cast a long shadow over the administration. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP

House Rules Committee member Rep. Virginia Foxx, R-N.C., is flanked by Chairman Pete Sessions, R-Texas (left), and Rep. Rob Bishop, R-Utah (right), as the panel works May 7 on the creation of a special select committee to investigate the 2012 attack on the U.S. diplomatic outpost in Benghazi, Libya, that killed the ambassador and three other Americans. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

House Minority Leader Nancy Pelosi, D-Calif., said Friday that negotiations were continuing with House Speaker John Boehner, R-Ohio, over a Democratic role in the investigation into the circumstances surrounding the attack on the U.S. diplomatic mission in Benghazi, Libya, in 2012. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

South Carolina GOP Rep. Trey Gowdy leaves a closed-door Republican strategy meeting at the Capitol on Wednesday. Gowdy has been tapped to lead the new Benghazi investigative committee. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

Actress Cindy Lee Garcia (right) brought a copyright claim against Google with the help of attorney Cris Armenta over the film Innocence of Muslims, which was posted to YouTube in 2012. Jason Redmond/AP hide caption

itoggle caption Jason Redmond/AP

People gather at the site of a car bombing in Benghazi, Libya, on Wednesday — one year to the date after an attack on the U.S. consulate in the city killed the ambassador and three other Americans. Mohammed el-Shaiky/AP hide caption

itoggle caption Mohammed el-Shaiky/AP

The controversies facing his administration could be creating a stiff headwind for President Obama's second-term agenda. Jack Plunkett/AP hide caption

itoggle caption Jack Plunkett/AP

Then-CIA Director David Petraeus testifies on worldwide threats before the Senate Select Committee on Intelligence, on Jan. 31. Zhang Jun/Xinhua /Landov hide caption

itoggle caption Zhang Jun/Xinhua /Landov