A federal judge has dismissed a years-long free-speech lawsuit by a sidelined Santa Clara County prosecutor against District Attorney Jeff Rosen, but the turmoil between the two will continue as the plaintiff is pursuing a second appeal — and a second political run to unseat his boss.

Daniel Chung, a Santa Clara County prosecutor and political opponent of his boss District Attorney Jeff Rosen, lost a Sept. 17, 2025 court ruling in his First Amendment lawsuit alleging he was illegally punished for submitting an op-ed in The Mercury News. A federal judge sided with Rosen's stance that Chung was disciplined for speaking on behalf of the DA's office without authorization; Chung plans to appeal the ruling. (Photo courtesy of Daniel Chung)
Daniel Chung, a Santa Clara County prosecutor and political opponent of his boss District Attorney Jeff Rosen, lost a Sept. 17, 2025 court ruling in his First Amendment lawsuit alleging he was illegally punished for submitting an op-ed in The Mercury News. A federal judge sided with Rosen’s stance that Chung was disciplined for speaking on behalf of the DA’s office without authorization; Chung plans to appeal the ruling. (Photo courtesy of Daniel Chung) 

Judge Araceli Martínez-Olguín, of the Northern District of California, decided earlier this month to dismiss Daniel Chung’s First Amendment lawsuit alleging that he was the victim of retaliation for writing a February 2021 editorial submission. The opinion article, published in The Mercury News, argued that criminal-justice reforms had weakened consequences for serious offenders.

The heart of the First Amendment disagreement between Chung and Rosen was whether Chung was writing in his personal capacity or as a representative of the district attorney’s office. If he were presenting the opinion in his official capacity, he would have been subject to approval from his superiors.

Chung has always claimed he was writing as a private citizen; Rosen, through the County Counsel’s office, emphasized that the discipline of Chung was not rooted in the content of the op-ed but in him speaking for the office without authorization.

Chung was described as a deputy district attorney in the op-ed submission — part of standard attribution practice by The Mercury News — and the county highlighted an arbitrator’s finding that “it would be patently unreasonable” for a reader not to think Chung was speaking for the office, and so “even if (Chung’s) conduct was generally protected by the First Amendment, the county could nevertheless regulate through discipline that conduct.”

Martínez-Olguín wrote in her Sept. 17 ruling that the arbitrator’s finding meant “Chung is precluded from establishing that he was speaking as a private citizen in the Op-Ed, the speech is not constitutionally protected, and Chung’s First Amendment retaliation claim fails as a matter of law.”



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