American intelligence agencies had indications three days beforehand that the Syrian regime was poised to launch a lethal chemical attack that killed more than a thousand people and has set the stage for a possible U.S. military strike on Syria. The disclosure -- part of a larger U.S. intelligence briefing on Syria's chemical attacks -- raises all sorts of uncomfortable questions for the American government. First and foremost: What, if anything, did it do to notify the Syrian opposition of the pending attack?