The story

As support for the war in Afghanistan dips to an all-time low, some leading lawmakers are questioning President Obama's approach to what he calls a "war of necessity."

Just 39 percent of Americans favor the war in Afghanistan compared to 58 percent who oppose it, according to a national CNN/Opinion Research Corp. survey released Tuesday.

The poll follows the two deadliest months for the U.S. military in Afghanistan. In August, 48 U.S. troops were killed in the fighting, surpassing the previous high of 45 in July. Read full article »

CNN's Adam Levine, Barbara Starr and Paul Steinhauser contributed to this report.

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