Several Democratic lawmakers from California posted tributes to former Rep. Ellen Tauscher (D-Calif.) on Tuesday after news broke that she had died.

Tauscher, who also held a key role negotiating arms treaties in the Obama administration's State Department, died of pneumonia at age 67.

Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) issued a statement applauding Tauscher's leadership style and commitment to nonproliferation.

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"Ellen was an extraordinary force for progress who made a difference. To watch Ellen wield the gavel was to observe a masterclass in steady, steely leadership," Pelosi said.

"Her smart, strategic leadership, whether presiding over the House, chairing the Armed Services Strategic Forces Subcommittee or leading America’s arms control strategy, strengthened our democratic institutions and kept America safe," she added. "Her relentless commitment to nuclear nonproliferation, which is a pillar of America’s national security, beautifully honored the oath we all take: to support and defend the Constitution, and protect the American people."

Tauscher also chaired two of Sen. Dianne Feinstein Dianne Emiel FeinsteinFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Democrats shoot down talk of expanding Supreme Court Biden leads Trump by 12 points among Catholic voters: poll MORE's (D-Calif.) Senate campaigns in the 1990s. Feinstein said in a statement posted to Twitter that Tauscher "had a huge heart and was always ready with a story."

"When Ellen put her mind to politics, she was a force," Feinstein added.

The passing of Ellen Tauscher is a loss for us all. Ellen was brilliant, gracious and generous and always did her level best to lift up those around her. She’ll always be remembered. pic.twitter.com/cfai1mmGe3 — Sen Dianne Feinstein (@SenFeinstein) April 30, 2019

Rep. Eric Swalwell Eric Michael SwalwellSwalwell calls for creation of presidential crimes commission to investigate Trump when he leaves office 'This already exists': Democrats seize on potential Trump executive order on preexisting conditions Swalwell: Barr has taken Michael Cohen's job as Trump's fixer MORE (D-Calif.), who is running for president, on Twitter posted fondly about his time as a 20-year-old intern for Tauscher, whom he described as a "mentor and dear friend."

You can learn a lot about leadership as a 20-year-old intern working for a Congresswoman who always chose country over party, results over gridlock, and courage over fear. I learned all that from my mentor and dear friend, Ellen Tauscher. Rest In Peace. pic.twitter.com/i2n2y1ijLh — Rep. Eric Swalwell (@RepSwalwell) April 30, 2019

Fellow Democratic California Rep. Barbara Lee Barbara Jean LeeOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats call for investigation into Pentagon redirecting COVID-19 funds Steph, Ayesha Curry to be recognized by the Congressional Hunger Center MORE described her former colleague as a "passionate public servant, and a champion for global peace and diplomacy."

Saddened by news of the passing of Rep. Ellen Tauscher. Ellen was a friend, a passionate public servant, and a champion for global peace and diplomacy. My prayers are with her family at this difficult time. May we carry her baton forward in our work for a more peaceful world. — Rep. Barbara Lee (@RepBarbaraLee) April 30, 2019

And Rep. Mike Levin (D-Calif.) said that he was Tauscher's driver when he was a college student, adding that she offered "great advice."