An extensive investigation by the Justice Department's Civil Rights Division found that Arpaio had "promoted a culture of bias" within MCSO. Arpaio's team has been disputing their findings and Arpaio has said the probe is all just part of the Obama administration's re-election bid even though the investigation began during the Bush administration.
DOJ's letter said they were not willing to debate their findings with Apraio's office.
"Your letter suggests an unwillingness to resolve this matter though a negotiated settlement -- a position which makes litigation inevitable in the very near term," Austin wrote. DOJ's letter was in response to a letter Arpaio's lawyer sent Wednesday which again disputed the conclusions of DOJ's investigation.