THE CONFLICT IN IRAQ: INTELLIGENCE ASSESSMENT; GENERAL'S EXPECTED ADVICE - General, spy report raise Iraq stakes - Joint Chiefs chairman is expected to urge a steep cut in U.S. forces, posing a potential clash with surge supporters.

Administration and military officials say Marine Gen. Peter Pace is likely to convey concerns by the Joint Chiefs that keeping well in excess of 100,000 troops in Iraq through 2008 will severely strain the military. This assessment could collide with one being prepared by the U.S. commander in Iraq, Army Gen. David H. Petraeus, calling for the U.S. to maintain higher troop levels for 2008 and beyond.

Petraeus is expected to support a White House view that the absence of widespread political progress in Iraq requires several more months of the U.S. troop buildup before force levels are decreased to their pre-buildup numbers sometime next year.

Pace's recommendations reflect the views of the Joint Chiefs of Staff, who initially expressed private skepticism about the strategy ordered by Bush and directed by Petraeus, before publicly backing it.

According to administration and military officials, the Joint Chiefs believe it is of crucial strategic importance to reduce the size of the U.S. force in Iraq in order to bolster the military's ability to respond to other threats, a view that is shared by Defense Secretary Robert M. Gates.

Pace is expected to offer his advice privately instead of issuing a formal report. Still, the position of Pace and the Joint Chiefs could add weight to that of Bush administration critics, including Democratic presidential candidates, that the U.S. force should be reduced.

Those critics include Republican Sen. John W. Warner of Virginia, who on Thursday called on Bush to begin withdrawing troops in September to pressure the Iraqi government to move toward political compromise.

Any discord among the top U.S. generals could be awkward for Bush, who professes to rely heavily on advice from military leaders. But there also is tremendous pressure for military officers to speak with one voice and defer to Petraeus and other field commanders. It remains possible that the Joint Chiefs may opt to weaken their stance before approaching Bush.

According to a senior administration official, the Joint Chiefs in recent weeks have pressed concerns that the Iraq war has degraded the U.S. military's ability to respond, if needed, to other threats, such as Iran.