BISMARCK, N.D. (AP) — North Dakota officials are pressuring the state of Washington to back off from legislation requiring oil shipped by rail to have more of its volatile gases removed, urging the governor to veto the bill and threatening a lawsuit over worries it could hamper the energy industry of the nation’s No. 2 crude producer.

The bill awaiting Gov. Inslee’s signature requires a lower vapor pressure limit for crude shipped by rail than either North Dakota requirements or industry standards. Violations could result in fines of up to $2,500 per day per rail car.

Opponents say that “would result in a de facto ban of crude-by-rail traffic from North Dakota to refineries throughout the Pacific Northwest.

Inslee, who has made climate change a focus of his 2020 Democratic presidential campaign, was still reviewing the bill Tuesday.

State Mineral Resources Director Lynn Helms, who traveled to Washington in February to testify against the bill, has said previously that North Dakota will sue if the bill becomes law.