The drilling Trump proposes would take place in federal waters offshore in an area called the Outer Continental Shelf. But states control the 3 miles of ocean closest to shore and are proposing laws designed to make it difficult, or impossible, to bring the oil or gas ashore in their areas.
A look at the issue:
States including New Jersey, New York, California, South Carolina and Rhode Island have introduced bills prohibiting any infrastructure related to offshore oil or gas production from being built in or crossing their state waters. Washington state is threatening such a bill. Maryland has introduced a bill imposing strict liability on anyone who causes a spill while engaged in offshore drilling or oil or gas extraction.