President Bush has nominated one of his trusted advisers, Harriet Miers, to fill the second of two U.S. Supreme Court vacancies that have opened this year. Monday's announcement came shortly before Mr. Bush's choice for the earlier vacancy, John Roberts, was installed as the court's new chief justice. This is the first time in nearly 20 years that a U.S. president has had the chance to nominate two members of the country's highest court in quick succession. Speaking at the White House, President Bush described Ms. Miers as a "pioneer" who broke down barriers for women in the legal profession. The president said Ms. Miers, who has never been a judge, would strictly interpret the laws of the Constitution and not legislate from the bench. The 60-year-old nominee currently serves as White House legal counsel and was Mr. Bush's personal lawyer when he was governor of Texas. If confirmed by the Senate, she would replace retiring Justice Sandra Day O'Connor. Ms. Miers' own judicial views on controversial issues such as abortion and gay rights are largely unknown.