Nebraskans opposed to the Keystone XL pipeline are among those in Washington, D.C. taking part in a five-day protest.
Ranchers and tribal leaders rode in on horseback and put up tepees on the National Mall, hoping to get the White House's attention. They say the pipeline will damage the land and pollute drinking water.
"Number one, water is sacred to us,” says Cyril Scott of South Dakota’s Rosebud Sioux Tribe. “Mother Earth is sacred to us. We are here to protect all of them things here and our way of life."
Some tribal leaders say the pipeline violates treaties the U.S. agreed to and they want the president to reject the project outright. TransCanada wants the pipeline to carry oil from western Canada to the Texas Gulf Coast.