Standing Rock

Law enforcement vehicles line a road leading to a blocked bridge next to the Oceti Sakowin camp where people have gathered to protest the Dakota Access oil pipeline in Cannon Ball, N.D. (AP/David Goldman)

This could get ugly quick.

Law enforcement vehicles line a road leading to a blocked bridge next to the Oceti Sakowin camp where people have gathered to protest the Dakota Access oil pipeline in Cannon Ball, N.D. (AP/David Goldman)

Native Americans protest the Dakota Access oil pipeline on Friday, Aug. 12, 2016 near the Standing Rock Sioux reservation in southern North Dakota.
The federal government announced Friday that it was dispatching Bureau of Indian Affairs agents to help clear Dakota Access Pipeline protesters from the Standing Rock Sioux reservation.

In this image provided by Morton County Sheriff’s Department, law enforcement and protesters clash near the site of the Dakota Access pipeline on Sunday, Nov. 20, 2016, in Cannon Ball, N.D. (Morton County Sheriff’s Department via AP)

Military veterans huddle together to hold an American flag against strong winds during a march in Cannon Ball, N.D., on Monday. (AP Photo/David Goldman)
A group of US military veterans have vowed to block construction of the controversial Dakota Access pipeline.

The fight against the Dakota Access Pipeline is back.

Morton County Sheriff Kyle Kirchmeier looks up from his desk in Mandan, N.D. Kirchmeier has led the police response to the Dakota Access oil pipeline protests, and shrugs off criticism that that response has been heavy-handed. Nov. 22, 2016 (AP/James MacPherson)

"'People will mobilize again."

Trump could issue the executive order at any time.