Culprit behind CIA leak may not be found, says Bush

The leak is the first major scandal to hit the White House, but Bush told reporters: "I don't know whether we are going to find out the senior administration official.

"This is a large administration and there are a lot of senior administration officials, and I don't have any idea," he said after a cabinet meeting at the White House.

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But he added: "I want to know the truth. That's why I've instructed this staff of mine to cooperate fully with the investigators."

The White House had given staff until 2100 GMT Tuesday to hand over documents related to the leaking of the name of Valerie Plame, the wife of Joseph Wilson, a former ambassador who has accused the Bush administration of exaggerating the case for war against Iraq.