Sen. John Hoeven, R-N.D., says the acting secretary of the army has directed the Corps of Engineers to proceed with the easement for construction of the Dakota Access Pipeline.
The project, which is slated to carry North Dakota crude to Midwestern refineries, has drawn protesters who say oil might leak from the structure and contaminate water supplies, and that construction is disturbing lands sacred to the Sioux tribe.
In December, the Obama administration ordered a pause for an environmental study, but President Trump moved soon after his inauguration to support the pipeline, along with the Keystone XL pipeline for Canadian crude.
Hoeven said he had spoken with both Acting Secretary of the Army Robert Speer and Vice President Pence about the easement:
"This will enable the company to complete the project, which can and will be built with the necessary safety features to protect the Standing Rock Sioux Tribe and others downstream.
"Building new energy infrastructure with the latest safeguards and technology is the safest and most environmentally sound way to move energy from where it is produced to where people need it."
Hoeven also said he is working to get additional funds for law enforcement at the site.
The Standing Rock Sioux Tribe has fought against construction of the pipeline for months, with members and supporters living on the site, trying to block construction. The tribe said it will continue its battle:
"[The announcement] is ... not a formal issuance of the easement—it is notification that the easement is imminent. ...
"The Army Corps lacks statutory authority to simply stop the [environmental study] and issue the easement. The Corps must review the Presidential Memorandum, notify Congress, and actually grant the easement. We have not received formal notice that the [study] has been suspended or withdrawn."
Rep. Kevin Cramer, R-N.D., said in a statement that the pipeline is an "important piece of energy infrastructure enhancing America's energy security and putting North Dakotans and Americans back to work. President Trump has proven to be a man of action and I am grateful for his commitment to this and other critical infrastructure projects so vital to our nation."
Amy Sisk of Prairie Public Broadcasting contributed to this report.