ABCNews.com:  “The Justice Department has cut off negotiations with Sheriff Joe Arpaio and officials with the Maricopa County, Ariz., Sheriff’s Office in its effort to install an independent monitor to rein in the unconstitutional tactics used by officers there.

Arpaio, who calls himself “America’s Toughest Sheriff,” defied the Justice Department suggestion that it could sue the county and the sheriff’s office to force the issue.

“I am the constitutionally and legitimately elected Sheriff and I absolutely refuse to surrender my responsibility to the federal government,” he said in a letter the Justice Department today. “And so to the Obama administration, who is attempting to strong arm me into submission only for its political gain, I say, ‘This will not happen, not on my watch!’”

In December, the Justice Department released findings in its investigation of Arpaio’s office, noting there were significant civil rights violations, including the use of excessive force, and other systemic problems.”