WASHINGTON — Nearing the end of a weeklong demonstration against the Keystone XL pipeline, actress Daryl Hannah and musician Neil Young joined the Cowboy Indian Alliance Saturday to deliver a painted tipi to the Smithsonian National Museum of the American Indian.

Accepted by the museum as a gift for President Barack Obama, the tipi was intended to symbolize the alliance’s desire that the president block construction of the oil pipeline that would stretch from Alberta, Canada, to Nebraska; the entire pipeline system would continue to refineries in Texas. The pipeline would carry tar sands oil and needs State Department approval because it originates in a foreign country.

The alliance of farmers and ranchers, tribes and advocacy groups set up their encampment at the National Mall in protest of the Keystone XL pipeline on April 22.