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People gather in a teepee to participate in a traditional water ceremony with members of Indian tribes to show the threat that the Keystone pipeline XL poses to water sources while demonstrating on the National Mall, April 23, 2014 in Washington, DC. As part of its 'Reject and Protect' protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Mark Wilson/Getty Images) ( 486234361 )

A Native American tribal leader sits on his horse in front of the US Capitol in Washington on April 22, 2014 as the Cowboy and Indian Alliance protest the proposed Keystone XL pipeline, part of "Reject and Protect," a weeklong series of actions by farmers, ranchers and tribes against the tar sands oil pipeline from Canada to the US. (NICHOLAS KAMM/AFP/Getty Images) ( 529152723 )

Members of the Cowboy and Indian Alliance, including Native Americans, farmers and ranchers from across the United States, march down Independence Avenue while demonstrating against the proposed Keystone XL pipeline April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486096009 )

Members of the Cowboy and Indian Alliance, including Native Americans, farmers and ranchers from across the United States, are escorted by police as they march down Independence Avenue while demonstrating against the proposed Keystone XL pipeline April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486095997 )

(L-R) Samantha Jones (L) of the Sicangu Lakota Band of the Rosebud Sioux Tribe from Rosebud, South Dakota and Brandie Molina help raise a large tepee as part of a demonstration against the proposed Keystone XL pipeline on the National Mall April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486102695 )

Members of the Cowboy and Indian Alliance, including Native Americans, farmers and ranchers from across the United States, ride horseback down Independence Avenue as part of a demonstration against the proposed Keystone XL pipeline April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486096019 )

Members of the Cowboy and Indian Alliance, including Native Americans, farmers and ranchers from across the United States, prepare for a horseback ride to demonstrate against the proposed Keystone XL pipeline in front of the U.S. Capitol April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486103379 )

Members of the Cowboy and Indian Alliance, including Native Americans, farmers and ranchers from across the United States, prepare for a horseback ride as part of a demonstration against the proposed Keystone XL pipeline April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486102683 )

Shane Red Hawk (R) of the Sicangu Lakota Band of the Rosebud Sioux Tribe from Rosebud, South Dakota, joins other members of the Cowboy and Indian Alliance for a horseback ride on Independence Avenue while demonstrating against the proposed Keystone XL pipeline April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486103377 )

Members of the Cowboy and Indian Alliance, including Native Americans, farmers and ranchers from across the United States, hold a horseback ride while demonstrating against the proposed Keystone XL pipeline in front of the U.S. Capitol April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486102693 )

Native Americans from various tribes work together to erect a large tepee as part of a demonstration against the proposed Keystone XL pipeline on the National Mall April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486102699 )

Casey Camp of the Ponca Nation (L) shakes hands with Piscataway Indian Nation Chief Billy Redwing Tayac during a traditional opening ceremony to begin a demonstration against the proposed Keystone XL pipeline at the U.S. Capitol Reflecting Pool on the National Mall April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486096027 )

Members of the Sicangu Lakota Band of the Rosebud Sioux Tribe from Rosebud, South Dakota, pose for photographs with tourists from Chinga before a demonstration against the proposed Keystone XL pipeline outside the National Museum of the American Indian April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486097223 )

Nineteen-year-old Gianna Strong of the Sisseton-Wahpeton Tribe in Morton, Minnesota, pours water into the U.S. Captiol Reflecting Pool during a ceremony to demonstration against the proposed Keystone XL pipeline at the U.S. Capitol Reflecting Pool on the National Mall April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486096013 )

Amy Ray (L) and Emily Saliers of The Indigo Girls perform during a demonstration against the proposed Keystone XL pipeline on the National Mall April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486097225 )

Members of the Cowboy and Indian Alliance, including Native Americans, farmers and ranchers from across the United States, ride horseback down Independence Avenue as part of a demonstration against the proposed Keystone XL pipeline April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486096011 )

(L-R) Farhad Ebrahimi of Boston, Virginia Leavell of the District of Columbia and David Turnbull of San Francisco scoop horse manure up from the middle of Independence Avenue after members of the Cowboy and Indian Alliance rode horseback while demonstrating against the proposed Keystone XL pipeline April 22, 2014 in Washington, DC. As part of its "Reject and Protect" protest, the Cowboy and Indian Alliance is organizing a weeklong series of actions by farmers, ranchers and tribes to show their opposition to the pipeline. (Photo by Chip Somodevilla/Getty Images) ( 486095999 )