Voters arrive at a polling station in a fire station during California's special election on Proposition 50, a measure that would temporarily redraw congressional districts, in San Francisco, California, U.S., November 4, 2025. REUTERS/Carlos Barria

WASHINGTON (Reuters) -U.S. President Donald Trump accused the California redistricting proposal on the ballot on Tuesday of being "unconstitutional" and said all mail-in ballots were under "very serious legal and criminal review," without giving any evidence for his allegations.

Trump did not say what entities were reviewing the ballots.

(Reporting by Katharine Jackson and Bhargav Acharya; editing by Susan Heavey)