Crowd near the Supreme Court in Washington on Monday, Sept. 17, 2018, mourns Justice Ruth Bader Ginsburg, who died of lung cancer at age 80. (AP Photo/Evan Vucci)

Supporters of Supreme Court Justice Ruth Bader Ginsburg gather outside the Supreme Court in Washington on Monday, Sept. 17, 2018, to pay their respects to the late justice. (AP Photo/Evan Vucci)

“Justice Ginsburg was a strong advocate for the rule of law, and she will be missed. RIP,” the White House tweeted at 9:49 a.m. ET

– Supporters of Supreme Court Justice Ruth Bader Ginsburg said the justice had helped bring freedom and justice to millions.

“I’ve been following Ruth’s work and for over 30 years, she was truly one of a kind,” said outside the Supreme Court where Ginsburg died Monday.

She had been struggling with lung cancer for much of this year but the cancer had stabilized by the time of her death, said her sister, Deborah Smith.

Ginsburg, 85, was a key figure in the court’s landmark rulings on gun rights, health care and environmental law and was an outspoken liberal voice for civil rights and women’s rights.

“Justice Ginsburg was a strong advocate for the rule of law, and she will be missed. RIP,” the White House tweeted at 9:49 a.m. ET.

BFFs Jen Sorensen and Molly Campbell, women who became best friends in college but became best enemies after the Oscar-winning film “On the Waterfront” in which Sorensen played Sorensen’s nurse in prison, said they were stunned by Ginsburg’s death.

“We’ve got a really big scary White House surrounded by rednecks and a bunch of maniacs. But we’re not safe, and the president is not safe,” Sorensen told The Associated Press outside the Supreme Court on Monday.

“(I) actually feel a little bit better because I can’t write anymore because she did think she was going to die,” Campbell said with a laugh.

After her withdrawal from the Supreme Court in 2009 from a case involving contraception, Ginsburg said “liberty is more profound than justice.”

Ginsburg was elected to the court in 1978 and was the only woman to serve on the nation’s highest court. She was narrowly re-elected as the justice in 2012, and has been at the helm since 2009.

She was diagnosed with lung cancer last year and previously had colon cancer. Her husband, Marty Ginsburg, is a lawyer who has represented some of America’s top law firms.

On her deathbed, Ginsburg said, “I have been fighting a good fight, for this country for the last 15 years, and it is worthwhile.”