Longtime conservative activist and Eagle Forum founder Phyllis Schlafly died Monday. She was 92.

“Today, Phyllis Schlafly passed away in the presence of her family at her home in St. Louis, Missouri,” the Eagle Forum posted in a statement on its website.

The group called its founder, who it said spent 70 years in public service, “an indomitable pro-family grassroots advocate and organizer.”

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“Her focus from her earliest days until her final ones was protecting the family, which she understood as the building block of life. ... From military superiority and defense to immigration and trade; from unborn life to the nuclear family and parenthood, Phyllis Schlafly was a courageous and articulate voice for common sense and traditional values.”

Schlafly was a constitutional lawyer, the author of 27 books and a prominent public speaker. Her latest book, from co-authors Ed Martin and Brett Decker, is set to be released on Tuesday. It lays out how GOP nominee Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE is “a surprising conservative choice” for president, the Washington Times reported.

"Phyllis Schlafly is a conservative icon who led millions to action, reshaped the conservative movement, and fearlessly battled globalism and the 'kingmakers' on behalf of America's workers and families," Trump said in a statement Monday night. "I was honored to spend time with her during this campaign as she waged one more great battle for national sovereignty. I was able to speak with her by phone only a few weeks ago, and she sounded as resilient as ever. Our deepest prayers go out to her family and all her loved ones."

Schlafly led grass-roots campaigns against Communism, abortion and the Equal Rights Amendment and galvanized conservatives for almost two generations, the New York Times said. She may be most well-known for leading opposition to the Equal Rights Amendment, arguing that it would end of the traditional family.

Known as “the first lady of anti-feminism,” the Los Angeles Times reported, Schlafly died of natural causes.

“America has lost a great stateswoman, and we at Eagle Forum and among the conservative movement have lost a beloved friend and mentor, who taught and inspired so many to fight the good fight in defense of American values," Eagle Forum First Vice President Eunie Smith in a statement.

According to Federal Election Commission reports, a political action committee bearing her name was registered by Ed Martin, the president of the Eagle Forum. It’s called Phyllis Schlafly's Eagle PAC.

“There will never be another Phyllis Schlafly,” Smith continued. “Today is a day to celebrate her amazing legacy and to remember the profound difference she made in the conduct of American public policy. Thank you, Phyllis. We will not grow weary.”

Updated 8:08 p.m.