Congress can only defund, it has no Consitutional authority to set foreign policy. POTUS will confidently veto an unconstitutional Congress.
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War Bill Passes House, Requiring an Iraq Pullout

The House on Wednesday narrowly approved a $124 billion war spending bill that would require American troops to begin withdrawing from Iraq by Oct. 1, setting the stage for the first veto fight between President Bush and majority Democrats.

Only hours after Gen. David H. Petraeus, the commander in Iraq, told lawmakers he needed more time to gauge the effectiveness of a troop buildup there, the House voted 218 to 208 to pass a measure that sought the removal of most combat forces by next spring. Mr. Bush has said unequivocally and repeatedly that he will veto it.

http://www.nytimes.com/2007/04/26/wa...in&oref=slogin