ROANOKE, Va. (AP) _ Developers of a proposed interstate natural gas pipeline have moved to begin a federal review of the project. Mountain Valley Pipeline LLC asked the Federal Energy Regulatory Commission this week to initiate the agency’s pre-filing process.Commission spokeswoman Tamara Young-Allen tells The Roanoke Times that the process is designed to identify and resolve issues before a formal application is filed. The 300-mile Mountain Valley Pipeline is a joint venture between EQT Corp. and NextEra Energy Era Inc. It would run from Wetzel County, West Virginia, to another pipeline in Pittsylvania County. The pipeline must be approved by the commission before it could be built.Virginia Gov. Terry McAuliffe and West Virginia Gov. Earl Ray Tomblin have expressed support for the pipeline.