Last December, the DOJ released a scathing report accusing Arpaio's office of racially profiling Latinos, basing immigration enforcement on racially charged citizen complaints and punishing Hispanic jail inmates for speaking Spanish in Arizona's most populous county. Maricopa County includes Phoenix and its surroundings.
The DOJ also accused Arpaio of having a culture of disregard for basic constitutional rights.
The civil rights allegations have led some Arpaio critics to call for his resignation, including the National Council of La Raza, a prominent advocacy group for Latinos.
The sheriff's office also is facing criticism over more than 400 sex-crimes investigations - including dozens of alleged child molestations - that hadn't been investigated adequately or weren't examined at all over a three-year period ending in 2007.]