Bush signed the veto with a pen given to him by Robert Derga, the father of Marine Corps Reserve Cpl. Dustin Derga, who was killed in Iraq on May 8, 2005. The elder Derga spoke with Bush two weeks ago at a meeting the president had with military families at the White House.

Derga asked Bush to promise to use the pen in his veto. On Tuesday, Derga contacted the White House to remind Bush to use the pen, and so he did. The 24-year-old Dustin Derga served with Lima Company, 3rd Battalion 25th Marines from Columbus, Ohio. The five-year Marine reservist and fire team leader was killed by an armor-piercing round in Anbar province.

Minutes after Bush vetoed the bill, an anti-war demonstrator stood outside the White House with a bullhorn: "How many more must die? How many more must die?"

Earlier at the Capitol, Democrats held an unusual signing ceremony of the $124.2 billion bill before sending it to the White House.

"The president has put our troops in the middle of a civil war," said Reid. "Reality on the ground proves what we all know: A change of course is needed."

For his part, Bush flew to Florida to meet with military commanders and said the Democratic proposal would turn Iraq into a "cauldron of chaos." With sleeves rolled up, Bush shook hands with troops at MacDill Air Force Base in Tampa, the headquarters of U.S. Central Command, which oversees military operations in the Middle East, including Iraq. Then Bush returned to the White House to announce his veto just before network news shows.

Democratic leaders refused to discuss their approach to Wednesday's meeting with Bush. Past meetings have not led to any compromises, although members said this time they hoped Bush would signal a willingness to negotiate.

"I don't want to get into a negotiation with myself," Reid said when asked about conversations with Senate Republican leader Mitch McConnell (news, bio, voting record) of Kentucky.

McConnell and other Republicans have said they would agree to provisions that lay out standards for the Iraqi government to meet in creating a more stable and democratic society.

"A number of Republicans think that some kind of benchmarks properly crafted would be helpful," McConnell said. Bush and GOP allies have said they will oppose legislation that ties progress on such standards to a withdrawal of U.S. combat forces.

"House Republicans will oppose any bill that includes provisions that undermine our troops and their mission, whether it's benchmarks for failure, arbitrary readiness standards or a timetable for American surrender," said Minority Leader John Boehner (news, bio, voting record), R-Ohio.

Some Republicans say they would support tying goals for Iraqi self-defense and democracy to the more than $5 billion provided to Iraq in foreign aid. But such an idea hasn't piqued the interest of Democrats.

When Bush announced a U.S. troop increase in January, he said Iraq's government must crack down on both Shiites and Sunnis, equitably distribute oil wealth, refine its constitution and expand democratic participation. He attached no consequences if these benchmarks were not met.

Tuesday's developments came exactly four years after Bush's speech on the aircraft carrier USS Abraham Lincoln decorated with a huge "Mission Accomplished" banner. At the time, Bush's approval rating was 63 percent, with the public's disapproval at 34 percent.

Four years later, only 35 percent of the public approves of the job the president is doing, while 62 percent disapprove, according to an April 2-4 poll from AP-Ipsos.

Bush has used his veto power only once before, when he rejected a measure last summer to lift restrictions on federal money for embryonic stem cell research.

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