Fact check: When did newsom sue trump

1. Summary of the results

Based on the analyses provided, Governor Gavin Newsom sued President Trump in June 2025 regarding the federalization of the California National Guard. The lawsuit was filed by Governor Newsom and Attorney General Rob Bonta against President Trump and the Department of Defense ^[1].

The timing appears to be after June 6, 2025, but before June 27, 2025 ^{[1] [2]}. One source specifically mentions that California sued the Trump administration on a Monday, though the exact date isn't specified ^[2]. The legal challenge centered on Trump's order to federalize the California National Guard for deployment to Los Angeles, which Newsom characterized as an "illegal takeover" and "unprecedented power grab" ^{[1] [2]}.

The case was heard by Judge Charles Breyer in federal court ^[3]. Newsom's legal arguments claimed that Trump's action was an abuse of presidential authority, unnecessary and counterproductive, and violated state sovereignty ^[1].

2. Missing context/alternative viewpoints

The analyses reveal that this was not Newsom's only lawsuit against Trump. There was at least one other significant legal challenge involving California's clean air policies, where Newsom sued Trump over attempts to revoke the state's clean air authority ^[4]. This suggests a pattern of legal confrontations between California and the Trump administration.

The sources don't provide Trump administration's detailed justification for federalizing the National Guard, which would offer important context about the federal government's perspective on the necessity of this action. Additionally, the analyses don't reveal the final outcome of Judge Breyer's ruling or whether there were any preliminary injunctions granted.

Political motivations from both sides are not thoroughly explored - Newsom, as a prominent Democratic governor with potential national ambitions, would benefit from positioning himself as a strong opponent to Trump's policies, while Trump's administration would benefit from demonstrating federal authority over state resistance.

3. Potential misinformation/bias in the original statement

The original question "when did newsom sue trump" is overly simplistic and potentially misleading because it implies there was only one lawsuit between these parties. The analyses clearly show that Newsom sued Trump on multiple occasions - both regarding the National Guard federalization and California's clean air policies ^{[5] [6]}.

The question lacks specificity about which lawsuit is being referenced, creating ambiguity. Someone seeking information based on this question might receive incomplete information if they're not aware of the multiple legal challenges between California and the Trump administration.

The framing also doesn't acknowledge the institutional nature of these lawsuits - they weren't personal legal disputes but rather constitutional challenges involving state versus federal authority, with Newsom acting in his official capacity as governor alongside the state's Attorney General.