Standing Rock Sioux tribe opposes Trump order on Dakota pipeline: statement
Protesters block a highway during a protest in Mandan against plans to pass the Dakota Access pipeline near the Standing Rock Indian Reservation, North Dakota, U.S. November 15, 2016. REUTERS/Stephanie Keith

The Standing Rock Sioux tribe in a statement on Tuesday said it opposed U.S. President Donald Trump's executive order that would allow the Dakota Access Pipeline to move forward.

The tribe, in a statement, said the $3.8 billion project would contaminate U.S. and tribal water supply, and that it intends to take legal action against the decision. Separately, a lawyer for the tribe said the action was being done "hastily and irresponsibly."

(Reporting By David Gaffen; Editing by Meredith Mazzilli)