A California judge made a “preliminary finding” Thursday that attorney John Eastman breached professional ethics when he aided Donald Trump’s bid to overturn the 2020 election, a significant milestone in the lengthy proceedings over whether Eastman should lose his license to practice law.

Eastman said Thursday that the extensive disbarment proceedings — which delved deeply into his allegations of election fraud and irregularities, as well as his fringe theories about the vice president’s power to unilaterally choose the winner of the presidential election — had strengthened his belief that the 2020 election was tainted. Now, state bar officials are preparing to present “aggravation” evidence aimed at justifying their call to strip Eastman, a veteran conservative attorney who once clerked for Supreme Court Justice Clarence Thomas, of his law license.