GOP senators are putting the pressure on Attorney General Eric Holder to appoint a special counsel to investigate whether the White House is responsible for national security leaks.

"The numerous national security leaks reportedly originating out of the executive branch in recent months have been stunning," according to a copy of the letter to Holder, signed by more than 30 GOP senators and obtained by Fox News. "If there were ever a case requiring an outside special counsel with bipartisan acceptance and widespread public trust, this is it."

Among the concerns about the leaks are recent news reports regarding the United State's drone attacks in the Middle East.

Their letter points out the recent New York Times story about the drone program and its list of human targets states the reporting involved interviews with "three dozen of [President Obama's] current and former advisers."

It suggests that Thomas Donilon, the national security adviser, is a likely source, in part because he was frequently cited in David Sanger's book "Confront and Conceal."