The issue is his decision to re-hire deputy Caren Carl Mandoyan who faced allegations of domestic violence.
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Back in 2016 Mandoyan was fired by then-Sheriff Jim McConnell. His ex-girlfriend, who is also a fellow deputy, alleged Mandoyan grabbed her by the neck and tried to break into her home twice.
Villanueva says he looked at the case and found discrepancies.
"There was no evidence of domestic violence, there was no evidence of attempted burglary," says Villanueva.
Patricia Giggans, the chair of the sheriff civilian oversight commission and an advocate for abused women, has concerns.
"The sheriff is trying to try this in the court of public opinion... because he keeps bringing it up and keeps dropping bits of information and evidence that he says are relevant," says Giggans.
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The sheriff believes it's all a political fight.
"The issue of Mandoyan, you have to set his case aside, is the issue of authority and that's what the board is going at, after my authority to hire and to terminate," says Villanueva.
There is a court case scheduled for June to decide this issue.