California Attorney General Xavier Becerra, however, said Monday that his office received "disturbing reports" that some Republican Party officials are not willing to remove the "unofficial" boxes.
California Republican Party spokesman Hector Barajas told CNN in a statement earlier Monday that the unofficial boxes amounted to an opportunity for "friends, family, and patrons to drop off their ballot with someone they know and trust."
"The Democrat anger is overblown when state law allows organizations, volunteers or campaign workers to collect completed ballots and drop them off at polling places or election offices," Barajas claimed.
Fresno County GOP Chairman Fred Vanderhoof also maintained that the party wasn't doing anything wrong in an interview with CNN, alleging without evidence that the state Democratic Party was ballot harvesting.
"We have a hypocritical situation," he said.
The instillation of unofficial ballot drop boxes comes as President Donald Trump continues to lean into a conspiratorial message
around the US voting process and mail-in voting in particular ahead of the November election.
While rare instances of voter fraud from mail-in ballots do occur, it is nowhere near a widespread problem in the US election system.
Mail ballot fraud is exceedingly rare in part because states have systems and processes in place to prevent forgery, theft and voter fraud. Those systems would apply to both absentee ballots and mail-in ballots for in-state voters.