[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/POLITICS/08/24/obama.afghanistan/art.afghanistan.gi.jpg caption="U.S. soldiers patrol an eastern Afghan village. President Obama has called Afghanistan a 'war of necessity.'"]
(CNN) - Adm. Michael Mullen, the highest-ranking man in the U.S. military, said the situation in Afghanistan is getting worse, as fresh indications emerge that President Obama soon could be asked to commit more American troops.
"I think it is serious and it is deteriorating. And I've said that over the last couple of years, that the Taliban insurgency has gotten better, more sophisticated. Their tactics, just in my recent visits out there and talking with our troops, certainly indicate that," Mullen, chairman of the Joint Chiefs of Staff, said Sunday on CNN's "State of the Union."
Obama has called the situation in Afghanistan a "war of necessity," and senior U.S. military officials said the latest military assessment shows that the Taliban exert "considerable influence" over a third of the country's landmass. But in the United States, support for the Afghanistan war is at an all-time low, according to CNN polling released this month.
Gen. Stanley McChrystal, the top U.S. general in Afghanistan, has been conducting an assessment of the progress of Obama's mission there. McChrystal is expected to present his review in the coming weeks.
Asked if the president is concerned there might not be enough troops on the ground, White House spokesman Bill Burton said that Obama laid out a "winning strategy" earlier this year and that the administration would wait for McChrystal's assessment and "make a decision accordingly."
The Pentagon has said no decision has been made regarding whether McChrystal will ask for more troops, but members of a congressional delegation who met with him said there's no doubt he will.