Updated at 8:57 a.m. Tuesday: Revised to include a response from former NRA president Marion P. Hammer.

Yeti, an Austin company that sells accessories for the outdoors, has picked a fight with the National Rifle Association after the group claimed that the business no longer wanted to be a vendor for an NRA fundraising arm.

In a letter posted to the group's Institute for Legislative Action website, former NRA president Marion P. Hammer announced that Yeti had severed ties.

"Suddenly, without prior notice, Yeti has declined to do business with The NRA Foundation saying they no longer wish to be an NRA vendor, and refused to say why," Hammer wrote Friday. "They will only say they will no longer sell products to The NRA Foundation. That certainly isn't sportsmanlike. In fact, Yeti should be ashamed."

But Yeti accused the NRA of misrepresenting the situation.

"A few weeks ago, Yeti notified the NRA Foundation, as well as a number of other organizations, that we were eliminating a group of outdated discounting programs," Yeti said in a written statement posted to its Twitter account. "When we notified the NRA Foundation and the other organizations about this change, Yeti explained that we were offering them an alternative customization program broadly available to consumers and organizations, including the NRA Foundation. These facts directly contradict the inaccurate statement the (NRA) distributed on April 20."

Yeti didn't return a message Monday seeking comment. The company makes coolers, drinkware and other gear.

Hammer said in her letter that the company's coolers have been "a hot item" in the Friends of the NRA Foundation banquet and other events around the country. The NRA is hosting its national convention in Dallas next month.

Though Yeti challenged Hammer's criticisms, she stood by her remarks Monday.

"After three days Yeti issued a statement claiming they didn't really drop the NRA Foundation," she said in a statement to The Washington Post. "They claim they simply eliminated the entire program affecting NRA Foundation and other unnamed organizations. Isn't that like eliminating a job position so you can get rid of an employee?"

Hammer told the newspaper that the NRA Foundation had not been made aware that Yeti had discontinued discounts for other organizations as well. She added that the foundation had been forced to cancel orders that Yeti would not fill.

The NRA, which regularly opposes gun control measures, attracted intense criticism after the Feb. 14 school shooting in Parkland, Fla., that left 17 people dead, the latest in a string of high-profile mass killings in the U.S.

Companies that have stopped discounts or programs with the NRA include several car rental businesses, MetLife, Delta and United airlines, along with Nebraska-based First National Bank of Omaha, the nation's largest privately owned bank holding company.

The NRA Foundation reported $36 million in contributions, gifts and grants during fiscal 2016, according to a form the nonprofit is required to file with the Internal Revenue Service. It said its mission is to promote firearms and hunting safety, improve the skills of people who practice shooting sports and educate the public about firearms.

"Boy Scouts and 4-H groups are among the most frequent recipients of funding — for merit badge, hunter education and safety training," the charity reported in a federal form.

Hi @YETICoolers - you should reverse this terrible decision. Do you not understand who your base is? Will never buy or use any of your products again and we had a bunch. https://t.co/NAiB7Yb8KX — Chris Loesch (@ChrisLoesch) April 22, 2018

The foundation also provides funding for law enforcement training and organizes a seminar for attorneys who represent firearms owners.