When Gov. Tim Walz was announced as Kamala Harris’ running mate, Ben Jealous, the Sierra Club’s executive director, released a statement hailing him as someone who “has worked to protect clean air and water, grow our clean energy economy, and see to it that we do all we can to avoid the very worst of the climate crisis.” But to a group of Indigenous environmental activists familiar with Walz’s record in Minnesota—particularly their view he broke a promise to block the construction of Line 3, a cross-state oil pipeline—such a ringing endorsement of his green credentials rings hollow. A few days after her home state’s governor joined the ticket, Tara Houska, an attorney and Indigenous rights activist, expressed that point of view in an Instagram video post where she said he had led “a brutal, multi-year campaign to suppress Indigenous people and allies trying to stop Line 3 tar sands.” It showed a clash between protesters and police at a Line 3 pipeline construction site over a soundtrack of rising drums.