At the White House, the withdrawal of Harriet E. Miers as the president's nominee to the Supreme Court dominated the day. Still, officials waited anxiously for word about developments in the investigation, which has the potential to shape the remainder of Mr. Bush's second term.

Officials said that Mr. Bush, who traveled to Florida on Thursday to view the damage from Hurricane Wilma, would keep to his planned schedule on Friday, including a speech on terrorism in Norfolk, Va., if indictments were announced.

Administration officials said that the White House would seek to keep as low a profile as possible if indictments were issued; Scott McClellan, the White House press secretary, did not schedule a briefing for Friday, and Mr. Bush plans to leave in the afternoon for a weekend at Camp David.

With so much about the outcome of the case still in doubt, political strategists in Washington spent the day gaming out the implications of different endings.

The apparent delay in a decision about whether to charge Mr. Rove, and the continuation of the criminal inquiry, is a mixed outcome for the administration. It leaves open the possibility that Mr. Rove, Mr. Bush's closest and most trusted adviser, could avoid indictment altogether, an outcome that would be not just a legal victory but also the best political outcome the White House could hope for under the circumstances.

Yet, in apparently leaving Mr. Rove in legal limbo for now, Mr. Fitzgerald has left him and Mr. Bush to twist in the uncertainty of a case that has delved deep into the innermost workings of the White House and provided Democrats an opportunity to attack the administration's honesty and the way it justified the war to the American people.

Mr. Rove has had to step back from many of his public duties, including appearing at fund-raisers, and he is likely to have to keep a low profile as long as the investigation continues. It could also leave him distracted, depriving the White House of his full attention at a time when Mr. Bush is struggling to regain his political footing after months in which the bloody insurgency in Iraq, Hurricane Katrina and the failed Supreme Court nomination of Harriet E. Miers have left the administration stumbling.