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Imposing a warrant requirement would be a serious hindrance to the government in monitoring the activities of al-Qaeda.

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And where do you get this amazing bit of information from? "Serious hinderance"??? Please.

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I don't know what the current law on this issue is,

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That's obvious.

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but there are yes and no answers on closely related questions. A matter for debate.

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Please. Lawyers representing clients can always create "matters for debate". Lawyers -- and officials -- sworn to uphold the constitution have a greater duty. John Yoo should be disbarred; he certainly has been disgraced. As for impeachment, it is certainly more warranted here than it was in Clinton's case. But it is still a bad idea.