Mexico's ruling party is asking the governor of Nuevo Leon state and the mayor of the state capital of Monterrey to step down temporarily while police investigate casino corruption allegations.
President Felipe Calderon's National Action Party, or PAN, says Gov. Rodrigo Medina and Mayor Fernando Larrazabal should leave their posts so the probe into an arson that killed 52 people last month doesn't become "a struggle between political forces."
The party made its request in a letter sent to both officials late Tuesday.
Larrazabal is a member of the PAN but Medina belongs to the Institutional Revolutionary Party.
Larrazabal's brother was detained last week after video of him taking wads of cash inside an unidentified casino just days before the fire surfaced.