Washington ? Democrats aggressively challenged President Bush’s Iraq policy Thursday at both ends of the Capitol, gaining House committee approval for a troop withdrawal deadline of Sept. 1, 2008, but suffering defeat in the Senate on a less sweeping plan to end U.S. participation in the war.

Anti-war Democrats prevailed on a near-party line vote of 36-28 in the House Appropriations Committee, brushing aside a week-old veto threat from the administration and overcoming unyielding opposition from Republicans.

“I want this war to end. I don’t want to go to any more funerals,” said New York Rep. Rep. Jose Serrano, one of several liberal Democrats who have pledged their support for the legislation despite preferring a faster end to the war.

“Nobody wants our troops out of Iraq more than I do,” countered Rep. C.W. Bill Young of Florida, who sought unsuccessfully to scuttle the timeline for a troop withdrawal. “But we can’t afford to turn over Iraq to al-Qaida.”

In the Senate, after weeks of skirmishing, Republicans easily turned back Democratic legislation requiring a troop withdrawal to begin within 120 days. The measure set no fixed deadline for completion of the redeployment, but set a goal of March 31, 2008. The vote was 50-48 against the measure, short of the 60 needed for passage.

Senate Democrats promptly said they would try again to force a change in Bush’s policy beginning next week when they begin work on legislation providing money for the war in Iraq and Afghanistan.

The day’s votes in Congress underscored the unpredictable wartime clash between commander in chief and lawmakers.

In the House, only one committee Democrat, liberal Rep. Barbara Lee of California, voted against her party’s plan, saying it did not go far enough.

“I believe the American people sent a mandate to us to bring home our men and women before the end of the year,” she said.

Overall, the committee vote strongly suggested Democrats will be able to push their troop withdrawal timetable through the full House next week. Even so, there is little if any prospect the Senate will agree to anything remotely similar. And even if it does, Bush’s threatened veto would force Speaker Nancy Pelosi and other war critics back to the drafting table.