, the Houston energy giant that filed for protection under Chapter 11 of the bankruptcy law.
Justice Owen, who was elected in 1994 with the help of an $8,600 donation from Enron, later wrote a majority opinion that reversed a lower court order, saving the company about $225,000 in taxes.
Senator Patrick J. Leahy, the Vermont Democrat who is chairman of the Judiciary Committee, recently sent a series of questions to the White House asking for comment on the issue of any relationship between the donations and her rulings.
Mr. Gonzales said that he had examined the issue and found nothing improper on Justice Owen's part. He said he would soon write to Mr. Leahy outlining his position.
"Based on our review she's superbly qualified to serve on the Fifth Circuit," he said. "She's extremely bright, extraordinarily dedicated and very principled."
But opponents of Justice Owen are certain to recall a dispute that arose in 2000, when Mr. Gonzales was a fellow justice on the Texas court and Justice Owen was one of three court members who wrote dissents in a case involving a new Texas law regarding parental notification of abortions among minors. At the time, Mr. Gonzales suggested that the narrow reading of the law by the dissenters was "an unconscionable act of judicial activism."
Anne Womack, a spokesman for Mr. Gonzales, minimized the significance of the disagreement. "Judge Gonzales's opinion and Justice Owen's dissent reflect an honest and legitimate difference of how to interpret a difficult and vague statute," Ms. Womack said.
Justice Owen's nomination is likely to bring the abortion debate into play. Kate Michelman, the president of the National Abortion Rights Action League, said that abortion rights groups would strongly oppose her. "We regard her as someone who exemplifies the most extreme hostility to reproductive rights of any of the nominees that President Bush has named," Ms. Michelman said.
Other Bush nominees who could become the subject of sharp battles include Miguel Estrada, a strong conservative who has been nominated to the United States Court of Appeals for the District of Columbia Circuit, and D. Brooks Smith, nominated for the United States Court of Appeals for the Third Circuit, in Philadelphia.
Mr. Leahy has promised hearings this year to Ms. Owen, Mr. Estrada and Prof. Michael W. McConnell of the University of Utah, nominated to a seat on the United States Court of Appeals for the 10th Circuit, in Denver. Professor McConnell is considered the least likely to engender opposition of the three because of support for him among academics across the ideological spectrum.