The Glendale City Council has approved a resolution to support the Tohono O’Odham Nation’s proposal to build a casino near the city’s sports and entertainment district.

The council voted 4-3 Tuesday to back the plan that the tribe projects will have a $300 million annual economic impact.

The Tohono O’Odham has been pushing a proposal to build a sprawling, Las Vegas-style casino since January 2009.

The Gila River Indian Community opposes the plan, saying it violates zoning and state laws and threatens the balance of tribal gaming in Arizona.

Opponents also argue a 2002 voter-backed compact bars more casinos from opening in metro Phoenix.

Gila River tribal officials say opponents will continue to do everything possible to stop the project.

The Tohono O’odham already operates several casinos in southern Arizona.