Jose Orozco, the former boyfriend of Pinal County Sheriff Paul Babeu, has filed a $1 million lawsuit against Babeu, the Arizona Republic reported.

Attorneys for Orozco filed a notice of claim on Monday with the sheriff and the county's Board of Supervisors.

Orozco's status as a Mexican national who is believed to be a legal immigrant on a tourist visa poses problems for Babeu, a vocal opponent of illegal immigration.

The 43-year-old Babeu acknowledged last month that he's gay in the course of denying charges made by Orozco that Babeu threatened to have him deported if he discussed their relationship.

The allegations, and now the lawsuit, threaten to derail Babeu's campaign for Arizona's 4th Congressional District, considered to be the state's most socially conservative.

Days after the Phoenix New Times broke the story, Babeu asked Arizona Attorney Tom Horne to open an independent investigation to clear his name.

Orozco has said he volunteered to work on Babeu's campaign websites and campaign filings show he gave $40 to Babeu's 2008 run for sheriff. Immigrants are prohibited from such activities.