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A Native American tribal leader sits on his horse in front of the U.S. Capitol in Washington on Tuesday as the Cowboy and Indian Alliance protests the proposed Keystone XL pipeline from Canada to the U.S. As part of its "Reject and Protect" protest, the alliance is organizing a week-long series of actions by farmers, ranchers and tribes to show their opposition to the pipeline.

Native American tribal leaders, non-native farmers and ranchers from across the United States march down Independence Avenue while demonstrating against the proposed Keystone XL pipeline on Tuesday.Chip Somodevilla / Getty Images