A herd of musk ox graze in an area of the Arctic National Wildlife Refuge in Alaska. (Arctic National Wildlife Refuge/AP)

The Trump administration on Thursday said it would seek to open up the entire coastal plain of the Arctic National Wildlife Refuge to oil and gas exploration, picking the most aggressive development option for an area long closed to drilling.

In filing a final environmental impact statement, the Interior Department’s Bureau of Land Management (BLM) took a key step closer to holding an oil and gas lease sale for the nearly 1.6 million-acre coastal plain, which is part of the 19.3 million-acre ANWR.