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WASHINGTON — After years of public silence but growing frustration, Democrats and Republicans in both houses of Congress are suddenly demanding far more oversight of the secret White House program of targeted killings abroad by missile-firing drones.
Several lawmakers, particularly concerned about the targeting of Americans, for the first time say they are considering creating a special court to review who gets put on the "kill list," and why. The goal, they say, is to impose judicial review on what has been an opaque process run from the White House and CIA.
A testy confirmation hearing Thursday for John Brennan, whom President Obama has nominated to run the CIA, unleashed built-up concerns in the Senate Intelligence Committee about what several members called the administration's lack of accountability on the secret legal thresholds for authorizing drone strikes.
Timeline: Notable targeted killings under Obama
By Friday, that had spawned a flurry of separate demands from the House and Senate judiciary committees for classified legal opinions governing drone strikes, and the possibility of the first congressional hearings on targeted killings of Americans accused of being Al Qaeda operatives.
"The deliberate killing of a United States citizen pursuant to a targeted operation authorized or aided by our government raises significant constitutional and legal concerns," said a letter to Obama from Sen. Patrick J. Leahy (D-Vt.), chairman of the Senate Judiciary Committee, and Sen. Charles E. Grassley (R-Iowa), the committee's ranking Republican.
Rep. Robert W. Goodlatte (R-Va), chairman of the House Judiciary Committee, sent a separate letter requesting Department of Justice opinions governing all targeted killings, including "signature strikes" on groups of military-age men whose names are not known but whose activities indicate they are affiliated with Al Qaeda or its allies.
Those strikes have caused the most casualties, including civilian deaths. They have raised a backlash of public anger in Pakistan, where the CIA drone strikes have been most intense.
It is far from clear whether Congress has the political will to place even minimal constraints on Obama's signature counter-terrorism effort, which polls show Americans broadly support. Drone strikes began under the George W. Bush administration, but the number of lethal attacks by remotely piloted aircraft has grown dramatically under Obama.
Over the last four years, CIA and U.S. military drone strikes have killed an estimated 3,000 suspected militants and terrorists in Pakistan, Yemen and Somalia.
The death toll includes three U.S. citizens, although only one, New Mexico-born Anwar Awlaki, was specifically targeted and killed in September 2011 as a senior operations figure in the Yemen branch of Al Qaeda.
Propagandist Samir Khan was killed in the vehicle with Awlaki in what U.S. officials called collateral damage, and Awlaki's 16-year-old son perished two weeks later in a drone strike aimed at his companion. A fourth American was inadvertently killed by the CIA's first drone strike in Yemen in 2002.
The Brennan hearing, and the leak of a Justice Department "white paper" Monday showing that the administration claims broader authority to kill militants than Obama and his aides had publicly suggested, have opened broad cracks in the secrecy surrounding the program.
Sen. Dianne Feinstein (D-Calif.), chairwoman of the Senate Intelligence Committee, told Brennan that she intended to "review proposals for … legislation to ensure that drone strikes are carried out in a manner consistent with our values."
"At one point it was a limited covert program; now everybody knows about it," Feinstein told reporters after the hearing. "And I think we need to see that this program is really run according to the American Constitution and according to law.… So I think there's going to be a new day of transparency."
Among the suggestions, she said, is to create something similar to the Foreign Intelligence Surveillance Court, a judicial body that operates in secret and reviews applications for intelligence eavesdropping warrants, to review drone strikes.
Sen. Angus King (I-Maine) said Friday that he supported creating a special court to review the targeting of any U.S. citizen. He said he reached that decision after the White House bowed to growing pressure this week and turned over to the Senate committee two classified opinions that the Justice Department had prepared to authorize the Awlaki killing.
"After reading the memos, it just struck me that in the case of Americans, it would be a reasonable restraint on the executive to know that they had to justify to somebody outside the executive the use of this power," King said in a telephone interview. "This is designed to protect in some measure the due process rights of Americans."
An Obama administration official said the president was not opposed in principle to outside review of drone strikes.