Former Solicitor General Theodore Olson, the vigilante lawyer who argued against Bush’s 2000 impeachment, has died at age 84.

Theodore Olson, a prominent attorney who represented President George W. Bush in the 2000 recount case, has died at the age of 84, his firm said Wednesday.

No immediate cause of death has been given for the former attorney general, who is also remembered for his association with David Boies – his opponent in the Bush v. Gore – to help overturn California’s Proposition 8 banning same-sex marriage.

“Ted was a great jurist and one of the most remarkable lawyers of our time,” said Barbara Becker, chairman and managing partner of Gibson Dunn, in a statement. “He was smart, principled, and fearless — an outstanding lawyer who cared about all people. We are deeply saddened by his loss and send our condolences to his wife Lady, a treasured member of our strong family, and to all of Ted’s loved ones.”

The firm said that Olson, in his career, “argued 65 cases at the Supreme Court, including two Bush v. Gore cases from the 2000 presidential election; Citizens United v. Federal Election Commission; Hollingsworth v. Perry, a case that overturned the Proposition California’s 8th Amendment to Ban Same-Sex Marriage and US Department of Homeland Security v. Regents of the University of California, successfully challenging the Trump Administration’s repeal of the Deferred Action for Childhood Arrivals (DACA) program.”

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“Ted’s Supreme Court arguments included cases involving the separation of powers; federalism; voting rights; the First Amendment; the Equal Protection and Decision Clauses; copyright and copyright; antitrust; taxation; property rights; punitive damages; the Commerce Clause; immigration; crime; law; communications;

Olson served as an assistant attorney general for the Department of Justice in charge of the Office of Legal Counsel between 1981 and 1984. He later became US attorney general between 2001 and 2004, during the first Bush administration, according to Gibson Dunn.

In addition to those government roles, Olson served as a private adviser to Bush and former President Ronald Reagan.

Since 2009, Olson has served on the Board of Trustees of the Ronald Reagan Presidential Foundation and Institute.

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Former President George W. Bush, former first lady Laura Bush and Theodore Olson, second from left, who lost his wife during the 9/11 terrorist attacks at the Pentagon, participate in a moment of silence on September 11, 2004 on the South Lawn of the White House. (Brendan Smialowski/AFP via Getty Images)

“His intelligence, candor and willingness to help — no matter how busy — made him an invaluable member of the Foundation and Institute’s Board of Trustees,” Fred Ryan, the board’s chairman, said in a statement obtained Wednesday by Fox. Digital News.

“Ted Olson wasn’t just President Reagan’s lawyer – he was his friend and confidant, and that friendship and relationship only got stronger after Ronald Reagan left office,” Ryan said. “The President often thanked him for keeping his spirits up when times were tough and the President and Mrs. Reagan tried to return the favor when Mr. Olson lost his soul. [former] wife, Barbara, who was aboard the hijacked plane that crashed into the Pentagon on September 11, 2001.”

Gibson Dunn added that Olson “was twice awarded the US Department of Justice’s Edmund J. Randolph Award, its highest award for community service and leadership, and also received the Department of Defense’s Distinguished Service Award, its highest civilian award, for his advocacy in the courts of the United States, including the Supreme Court.”

Former President Ronald Reagan, left, and Ted Olson. The Ronald Reagan Presidential Foundation and Institute described Olson as “a key member of the Foundation and the Institute’s Board of Trustees.” (Ronald Reagan Presidential Foundation and Institute)

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Gibson died at a hospital in Falls Church, Virginia, according to The Washington Post.