PHOENIX -- A Wyoming man has given more than $1.5 million to help defend Arizona's controversial immigration enforcement measure in court, Gov. Jan Brewer's office said Thursday.

The contribution from Timothy Mellon of Saratoga is the largest to Brewer's defense fund, which has amassed more than $3.6 million from 41,000 donors nationwide. Mellon could not immediately be reached for comment.

The latest legal bills released Thursday show Brewer's office has spent more than $440,000 for the first two months of defending the law.

The bills, obtained through a public records request by The Associated Press, are for work performed through June by Phoenix law firm Snell & Wilmer. They do not cover July hearings in federal court before a judge Susan Bolton temporarily blocked enforcement of the law's most controversial provisions.

Brewer has appealed Bolton's order to the 9th U.S. Circuit Court of Appeals.

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Her office is defending the state against seven lawsuits challenging Arizona's law, including cases filed by the U.S. Justice of Department, civil rights groups and two police officers.

Bolton has dismissed two of the cases.

"The fees incurred have been, and will continue to be, sizeable," Brewer spokesman Paul Senseman said, noting there have been more than 900 legal filings totaling more than 12,000 pages.

Arizona's law would generally require officers enforcing other measures to check the immigration status of people they suspect are illegal immigrants.