There is no public record of the operations or decisions of the panel, which is a subset of the White House's National Security Council, several current and former officials said. Neither is there any law establishing its existence or setting out the rules by which it is supposed to operate.

The panel was behind the decision to add Awlaki, a U.S.-born militant preacher with alleged al Qaeda connections, to the target list. He was killed by a CIA drone strike in Yemen late last month.

The role of the president in ordering or ratifying a decision to target a citizen is fuzzy. White House spokesman Tommy Vietor declined to discuss anything about the process.

Current and former officials said that to the best of their knowledge, Awlaki, who the White House said was a key figure in al Qaeda in the Arabian Peninsula, al Qaeda's Yemen-based affiliate, had been the only American put on a government list targeting people for capture or death due to their alleged involvement with militants.

The White House is portraying the killing of Awlaki as a demonstration of President Barack Obama's toughness toward militants who threaten the United States. But the process that led to Awlaki's killing has drawn fierce criticism from both the political left and right.

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