Outdoor clothing company Patagonia Inc. is endorsing two Democrats in key Senate races that could determine control of the upper chamber.

The company, which has upped its political activism since President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE took office, is backing Rep. Jacky Rosen Jacklyn (Jacky) Sheryl RosenSenators introduce bipartisan bill to help women, minorities get STEM jobs Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections Google, Apple, eBay to meet virtually with lawmakers for tech group's annual fly-in MORE in her challenge of Nevada Sen. Dean Heller Dean Arthur HellerOn The Trail: Democrats plan to hammer Trump on Social Security, Medicare Lobbying World Democrats spend big to put Senate in play MORE (R) and Sen. Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE in his Montana reelection bid against Republican Matt Rosendale.

Rosen and Tester are the first election endorsements in Patagonia’s history.

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“The company is endorsing candidates for the first time this year because of the urgent and unprecedented threats to our public lands and waters. Nevada and Montana are two states where Patagonia has significant company history and a long record of conservation accomplishments, and where the stakes are too high to stay silent,” the company said in a statement.

Patagonia CEO Rose Marcario said the company is backing Rosen “because she will fight to protect Nevada’s public lands and the vibrant outdoor industry that depends on them.”

And Yvon Chouinard, Patagonia’s founder, said it is backing Tester “because he gives a damn about protecting public lands — and, like us, he’s committed to fight back against anyone who doesn’t.”

The company has been outspoken in its support for public lands protections and its opposition to policy proposals from Trump and congressional Republicans to undo them. It has specifically fought Trump’s December decision to shrink the Bears Ears and Grand Staircase-Escalante national monuments in Utah, including filing a lawsuit over Bears Ears and declaring on its website that "The President Stole Your Land."

Chouinard has previously said Trump is “like a kid who's so frustrated he wants to break everything” and said his administration’s climate policies are “truly evil.”

Patagonia has also publicly clashed with House Natural Resources Committee Chairman Rob Bishop Robert (Rob) William BishopOVERNIGHT ENERGY: House passes sweeping clean energy bill | Pebble Mine CEO resigns over secretly recorded comments about government officials | Corporations roll out climate goals amid growing pressure to deliver House passes sweeping clean energy bill OVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right MORE (R-Utah) and Interior Secretary Ryan Zinke Ryan Keith ZinkeTrump extends Florida offshore drilling pause, expands it to Georgia, South Carolina Conspicuous by their absence from the Republican Convention Trump flails as audience dwindles and ratings plummet MORE, who slammed the company for manufacturing some of its products in China.