The national outdoor retailer REI on Thursday emailed its customers encouraging them to challenge Department of the Interior Secretary Ryan Zinke's planned review of public lands.

Zinke has proposed plans to re-evaluate which public lands receive federal funding and retain a national monument classification.

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The email comes a few days before the public comment period closes for Utah's Bears Ears National Monument, one of the parks Zinke's department is considering declassifying as a monument.

According to a report by CNN, the retailer, known for recreational outdoor equipment, told customers they were the "public" in "public lands" and should "tell Secretary Ryan Zinke why our public lands need to remain protected now and for future generations."

The email also linked to an REI website comment form that would be sent to the Department of the Interior.

Other outdoor retailers have hit the Trump administration's environmental and national monument policies in the past.

Outdoor-clothing maker Patagonia threatened to sue over an executive order calling for the Department of the Interior to review national monuments designated during Bill Clinton's, George W. Bush's and Barack Obama's presidencies.