WASHINGTON — President Bush's Iraq war funding request collapsed in the House Thursday as anti-war Democrats and Republicans unhappy about added domestic funding combined to kill — for now — $163 billion to support U.S. troops overseas.

The unlikely coalition formed when Republicans expected to provide the winning margin for the Iraq and Afghanistan funding instead sat out the vote in protest.

The GOP revolt was a response to Democratic strong-arm tactics in advancing the must-pass measure, as well as their efforts to add money for the unemployed and an expansion of GI education benefits.

The defeat of the Iraq funding measure came on a 149-141 tally. Nearly two-thirds of the House's Democrats voted against continuing to fund the war as 132 Republicans sat out the vote in protest.

Democrats then forced through a nonbinding plan seeking an exit from Iraq by December of next year. The 224-196 vote on the measure broke mostly along party lines.

Thirty-two Republicans joined Democrats on a 256-166 vote to sharply boost education benefits for Iraq-Afghanistan veterans under the GI Bill — despite an accompanying tax surcharge on the wealthy and small businesses — and voted to provide a 13-week extension of unemployment benefits.

The practical effect of the GOP protest is likely to be minimal. While it kills the war funding component of the bill for now, the Senate is sure to revive it next week.

The White House weighed in again Thursday with a promise to veto the bill over the non-war spending, the new tax surcharge and restrictions on Bush's ability to conduct the war in Iraq.

Republicans said the strategy by Democrats to load the war funding measure with non-war provisions like extending unemployment benefits unnecessarily delays getting funding to troops in the field.

But some Senate Republicans didn't get the message.

Conservatives Larry Craig, R-Idaho, and Richard Shelby, R-Ala., sent out numerous news releases crowing about domestic add-ons such as $450 million to combat Western wildfires and $75 million to help commercial fishermen in a substantially more expensive Senate companion measure that cleared the Appropriations panel Thursday.

In the House, each side accused the other of using the must-pass troop funding bill for political advantage.

"We're playing political games on the backs of our troops — you know it," said Minority Leader John Boehner, R-Ohio. "All this bill's going to do is delay the process for weeks and weeks and weeks while we play political games."

The GOP revolt came two days after the party suffered a devastating loss in a Mississippi special election that left Republicans saying big changes in the party message are needed in order to connect with voters. Thursday's moves were not orchestrated by party leaders and whether they were politically savvy was not at all clear.