Arpaio sent a letter to the Justice Department late last week challenging the request, calling it overly broad and a likely strain on the resources of the Maricopa County Sheriff's Office.
The sheriff met last week with federal investigators looking into potential civil rights violations resulting from his controversial hard line toward illegal immigrants in his jurisdiction, CNN said Sunday.
A spokesman for the Justice Department told CNN, however, that the Sept. 10 deadline stood and that the sheriff's department faces a lawsuit if it doesn't comply.
"We're reviewing the letter," department spokeswoman Xochitl Hinojosa said in a statement, "but as we have said all along, we expect the sheriff's office to provide nothing short of full compliance with the law."
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