International Business Times – There’s concern among some U.S. lawmakers that recent national security leaks that allegedly originated in the White House may have, among other consequences, jeopardized the security of Americans conducting the operations.

The leaks revealed President Barack Obama’s “kill list” for terrorists, a double agent inside al Qaeda in Yemen who foiled a bomb plot, as well as the Obama administration’s cyber attacks on Iran.

While information leaking in Washington isn’t new, Sen. Joe Lieberman, I-Conn., told Fox News Sunday that the recent successions of leaks are the worst. He chairs the Senate Homeland Security and Governmental Affairs Committee. (Read the show’s full transcript.)

“The recent series of leaks are the worst in a long time,” Lieberman said.

Two U.S. attorneys, one Bush appointee, have been appointed by U.S. Attorney General Eric Holder to conduct an investigation. However, Lieberman said that a special counsel is needed to shun any appearance of a conflict of interest.