A military source close to Gen. David Petraeus told Fox News that one of the first things the general will do when he takes over in Afghanistan is to modify the rules of engagement to make it easier for U.S. troops to engage in combat with the enemy, though a Petraeus spokesman pushed back on the claim.

Troops on the ground and some military commanders have said the strict rules -- aimed at preventing civilian casualties -- have effectively forced the troops to fight with one hand tied behind their backs.

The issue is likely to be front and center in Senate confirmation hearings for Petraeus next week.