Senate Majority Leader Harry Reid vowed tonight to block former US Solicitor General Theodore Olson from becoming attorney general if President George W. Bush nominates him to replace Alberto Gonzales.
Congressional and administration officials have described Mr Olson as a leading contender for the job as chief US law enforcement officer, but Reid declared, "Ted Olson will not be confirmed" by the Senate.
"He's a partisan, and the last thing we need as an attorney general is a partisan," Mr Reid, a Nevada Democrat, told Reuters in a brief hallway interview on Capitol Hill. Mr Reid and other Democrats argue that after Gonzales' stormy tenure the Justice Department needs to become less political.
Mr Gonzales resigned last month amid a series of investigations by Congress into his firing of federal prosecutors and his handling of Mr Bush's domestic spying program.
Earlier in the day, White House press secretary Tony Snow, amid word that Mr Bush was nearly ready to pick a new attorney general, told reporters, "We don't have a decision yet."
Current and former administration officials said they did not expect a decision until next week at the earliest. "Something happened. I don't know what," said one official, who had earlier expected an announcement this week.
Mr Olson has been among a handful of possible nominees to head the US Justice Department that the White House had been considering, congressional and administration officials said.
Others include federal appeals Judge Laurence Silberman, former Deputy Attorneys General George Terwilliger III and Larry Thompson, and Paul Clement, the current solicitor general.
The solicitor general serves as the administration's chief advocate in cases before the Supreme Court. One Justice Department official said Mr Thompson was widely liked and highly regarded. "People here would be happy with Ted, but they would be thrilled with Larry," the official said.