WASHINGTON (CNN) -- President Bush and his advisors "don't have a plan" nor an "overarching strategy" to fix the problems in Iraq, said Sen. Jim Webb, the newly elected Virginia Democrat who will deliver his party's official response Tuesday to the president's State of the Union address.

"What they have put on the table is more of a tactical adjustment to a specific set of circumstances on the ground rather than a plan where they can say definitively, 'This is an end point, this is the point where the American military will be off the streets of Iraq,'" Webb told reporters Tuesday, flanked by House Speaker Nancy Pelosi and Senate Majority Leader Harry Reid at a pre-State of the Union briefing.

"I don't want to anticipate what the president is going to say but at the same time, the difficulty many of us have had for a long time is that there is not a clearly understandable plan from the administration," he said.

Reid said he is working to "meld" together competing bipartisan resolutions that he said are very similar and "clearly indicate" the president's plan for Iraq is "unacceptable."

Extended Senate debate on one or more resolutions is expected next week.

"The president is the commander in chief," Reid said, explaining that while there are limits on what congressional Democrats can do to change the war in Iraq, the Democrats have presented suggestions. "He is not listening to anyone."

Webb's response will come from the ornate Mansfield room on the Senate side of the Capitol. His address -- which will be carried live by the major television networks -- will run about 8 minutes. It will focus first on domestic issues, such as economic fairness, before turning to the war, according to a Democratic leadership aide.

Reid and Pelosi chose Webb to deliver the response in part because he's a Vietnam veteran and former Republican Secretary of the Navy whose Marine son is deployed in Iraq. His surprise victory over former Sen. George Allen, R-Virginia, locked up Democratic control of the Senate.