Washington ? Losing their U.N. fight, President Bush, British Prime Minister Tony Blair and Spanish Prime Minister Jose Maria Aznar agreed Friday to take a last-ditch stab at reviving their troubled war resolution against Iraq at a summit.

Billed as a bid “to pursue every last bit of diplomacy,” the Sunday session at an Atlantic island was hurriedly scheduled amid a cascade of events — all pointing to war, perhaps just days away.

While announcing the summit, Fleischer renewed a long-standing U.S. threat to disarm Iraq, with force if necessary, even if the United Nations does not back military action. The Security Council voted 15-0 in November to demand that Iraq disarm or face “serious consequences.”

At Blair’s urging, Bush agreed to pursue a second resolution and said he would put it to a vote, even if the measure was doomed to fail.

As he backpedaled on that, White House officials hastily organized the summit in the Azores, islands that are part of Portugal.

National Security Adviser Condoleezza Rice said the leaders would explore “all of the possibilities,” a signal that the summit agenda would include talk about waging war without U.N. approval.

“It is time to come to a conclusion that says to Saddam Hussein, it is time for you to disarm or be disarmed,” she said.

If the leaders can somehow break the impasse, a compromise would almost certainly provide a brief extension of the second resolution’s Monday deadline, officials said.

U.S. and foreign diplomats said another alternative was more likely: Blair would ask Bush and Aznar to withdraw the resolution rather than face certain defeat.

Almost immediately, the White House would shift to a war footing, said aides who are preparing a major war address by Bush.

The speech, which could come as early as Monday, is expected to serve as a final ultimatum for Saddam to disarm or face war, White House officials said.