By demanding sensitive, sometimes embarrassing materials, some say, Libby appears to be goading the White House into issuing a pardon. Libby's spokeswoman did not respond to questions about a pardon.

One attorney familiar with the Plame case said Bush might find that it is in his interest to pardon Libby sooner rather than later.

A pardon before the trial could could cut off the disclosures and spare Vice President Dick Cheney from testifying as Fitzgerald's witness about Libby, his former chief of staff.

But the timing of a pardon, the attorney suggested, likely would depend on the outcome of the midterm elections.

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