Outdoor retailer Patagonia announced that it would sue the White House over President Trump's decision to reduce the size of two national monuments in Utah on Monday.

"Americans have overwhelmingly spoken out against the Trump Administration's unprecedented attempt to shut down our national monuments," Patagonia CEO Rose Marcario said in a statement, according to AdAge.

"We've fought to protect these places since we were founded and now we'll continue that fight in the courts," Marcario said.

The retailer also fired back at Trump on its website, changing the homepage to feature the message "The President Stole Your Land."

"In an illegal move, the president just reduced the size of Bears Ears and Grand Staircase Escalante National Monuments. This is the largest elimination of protected land in American history," the site reads.

Visitors to the site are encouraged to support groups that advocate for the protection of legal lands.

"Climbers, hikers, hunters and anglers all agree that public lands are a critical part of our national heritage and these lands belong not just to us, but to future generations," the site reads.

The outdoor retailer had threatened to sue Trump over his executive order mandating that the Interior Department review national monuments established during during Bill Clinton's, George W. Bush's and Barack Obama's presidencies.

Trump announced Monday that he would drastically shrink the size of Bears Ears and Grand Staircase-Escalante national monuments.