House Republicans are calling for an investigation into whether the Environmental Protection Agency planned to kill a controversial Alaska copper-and-gold mine from its inception, according to documents obtained by the Washington Examiner.

The EPA last month moved toward issuing a preemptive veto of a key mining permit for the proposed Pebble Mine in Bristol Bay, Alaska. The agency said the mine would destroy salmon runs that are home to nearly half the world’s sockeye salmon, and would disrupt the lives of native tribes.