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The U.S. Fish and Wildlife Service is directing dozens of wildlife refuges to return staffers to work to make sure hunters and others have access despite the government shutdown, according to an email obtained Wednesday by The Associated Press.

The partial restaffing of 38 wildlife refuges is angering wildlife groups, who accuse the Trump administration of trying to minimize the public impact of the more than two-week-old shutdown to limit the political blowback for President Donald Trump. Trump and Democrats in Congress are locked in a dispute over Trump’s demand for billions of dollars for a wall on the southern U.S. border.

In an email sent Tuesday afternoon, Margaret Everson, principal deputy director of the Fish and Wildlife Service, cites “opportunities, including hunting” that are being lost in the shutdown.

Everson advises in the email that 38 wildlife refuges around the country will bring back some furloughed staff using carryover funds.

“While many of our refuges have remained accessible, but not staffed, the extended lapse in federal appropriations is impacting both our ability to serve the public and to protect natural resources under our care in some places,” Everson wrote.

“For the next 30 days, using previously appropriated funds, we will bring back a limited number of employees to resume work on high priority projects and activities that support the Service’s mission and meet the public’s desire for access to Refuge lands,” Everson said in the email.

Everson did not immediately respond to an email from the AP seeking comment. An email sent to a Fish and Wildlife Service spokeswoman seeking comment elicited an automatic email saying she would respond to requests after the shutdown ends.

The shutdown has forced federal agencies to stop issuing paychecks for hundreds of thousands of government employees. Government services largely have been limited to the most pressing, such as Transportation Security Administration workers providing security at airports without pay.

Unlike as in some past shutdowns, the Interior Department — which oversees both wildlife refuges and national parks — initially had directed national parks to stay open but with little staffing, leading to pile-ups of uncollected garbage and human waste in parks. The National Park Service over the weekend said some parks could start using visitor fees to staff during the shutdown.

The Interior Department’s shutdown plan also says a small majority of agency staffers in charge of permitting and overseeing oil and gas development in federal waters will be kept at work no matter how long the shutdown lasts, “as they are essential for life and safety.”

The Trump administration has emphasized public use on public lands in general, especially by hunters and oil and gas developers. This has angered environmental groups, which say the government is putting wildlife and habitat at risk.

On Wednesday, the National Wildlife Federation, National Wildlife Refuge Association, the Coalition to Protect America’s National Parks, the Trust for Public Lands and the U.S. Fish and Wildlife Service Retirees Association urged the Trump administration to keep national parks, wildlife refuges and other public lands closed to the public during the shutdown.

“It is simply impossible to steward these shared American treasures properly, leaving thousands of lands and waters accessible to the public with no staff on site, even for an emergency,” the groups wrote in a letter.

Desiree Sorenson-Groves of the National Wildlife Refuge Association criticized the partial restaffing of some wildlife refuges.

“If it wasn’t essential to have these refuges open for the past three weeks, how is it essential now?” she asked. The bottom line was the Trump administration was trying to “make this less painful to the American public,” she said.

According to the email, the wildlife refuges being restaffed include Oklahoma’s Wichita Mountains, scene of an annual winter elk hunt.

Rod Smith, a biologist with Oklahoma’s Department of Wildlife Conservation, works with the federal government to coordinate the annual elk hunts in the Wichita refuge, 59,000 acres of craggy mountains jutting from the surrounding prairie.

Smith said Wednesday that he and others are awaiting word on whether the U.S. Fish and Wildlife’s directive on carryover money means a hunt can happen next week. If applicants who won the roughly 300 permits granted this year don’t get to hunt by the end of January, they may have to wait until next winter.

“We’ve had to have patience. Wait and see is always hard,” Smith said. “Then, just logistically it makes it difficult. And it will make it more difficult next year when we’re carrying people over.”

Other refuges identified in Everson’s letter are Midway Atoll and Kilauea Point in Hawaii, Tualatin River in Oregon, Billy Frank Jr. Nisqually in Washington state, the Sacramento, Kern, Sutter and five others in California, the Lower Rio Grande Valley refuge and four others in Texas, the Rocky Mountain Arsenal refuge in Colorado, Utah’s Bear River refuge, and the Bosque del Apache and Valle de Oro refuges in New Mexico.

Others in the Midwest and South are the Minnesota Valley and Fergus Falls refuges in Minnesota, the DeSoto in Iowa, the Mingo refuge and two others in Missouri, the Crystal River refuge and three others in Florida and the Wheeler refuge in Alabama.

In the Northeast, the refuges singled out for more staff in the shutdown are Pennsylvania’s John Heinz, the Wertheim of New York, Bombay Hook of Delaware, Parker River of Massachusetts, and the Umbagog of New Hampshire.