Mexico City - A strict new anti-immigration law enacted by the US state of Arizona is 'an obstacle to the solution of common problems' in North America , according to the Mexican government. President Felipe Calderon said Saturday that the draconian law signed by the US border state's Governor Janice Brewer the previous day would hurt US-Mexico relations. 'The criminalization of the migration phenomenon, far from contributing to cooperation between Mexico and the state of Arizona, represents an obstacle for the solution of common problems,' Calderon said.