Miles O’Brien:

Let's turn now to our continuing coverage of the Republican tax bill.

We have talked about some of its other impacts that go well beyond the matter of taxes. Tonight, we look at a particular part of the Senate bill that has not gotten a lot of attention, the possibility of opening up a pristine and long-protected part of Alaska to oil extraction.

William Brangham has been following this. He joins me now.

William, we're talking about ANWR, the Alaska National Wildlife Refuge. It's a beautiful place.