Ms. Marcario placed a call to her executive team and informed it that she had approved the lawsuit. Patagonia was suing the president.

‘The President Stole Your Land’

Since that week in December, the feud between Patagonia and the Trump administration has continued to simmer.

Mr. Bishop invited Mr. Chouinard to testify before the Committee on Natural Resources. Mr. Chouinard declined the offer, calling any hearing a “macabre celebration of the largest reduction in public lands in American history,” and the committee part of a “failed Orwellian government.”

Mr. Bishop replied to Mr. Chouinard with a tart letter of his own. “Although it is your right, living in a bubble isn’t healthy, nor is it conducive to a robust discussion on important matters of public policy,” he said. In an email, the committee’s press secretary said Mr. Chouinard was still welcome to testify.

Then in March, The Times published an article that showed oil and gas interests were central to the Trump administration’s decision to shrink Bears Ears. After that, Patagonia updated its website yet again. The new copy: “The President Stole Your Land and You Were Lied To.”

“The decision was nothing more than a political favor,” Ms. Sheehy, the company’s vice president of environmental activism, wrote in a blog post. “The redrawing of boundaries was deliberate, and directly influenced by an industry that spends millions of dollars lobbying the government to get what it wants.”

The Trump administration has not formally responded to the lawsuit filed by Patagonia and the other plaintiffs. Heather Swift, a spokeswoman for the Interior Department, said in an email that claims that the redrawing of boundaries was motivated by oil and gas interests were “patently and demonstrably false.”