As the partial government shutdown continues well into its third week, federal agencies and employees are feeling the pinch.
The entrance to Fort Point National Historic Site, a masonry seacoast fortification located on the southern side of the Golden Gate Bride, a popular tourist site, is closed due to the government shutdown in San Francisco on Jan. 8, 2019.John G. Mabanglo / EPA
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With negotiations at a standstill, Trump has threatened to keep key agencies shuttered for months or even a year if Democrats don't agree to fund his desired border wall, and he is considering declaring a national emergency to try to get it done without them.
Here are some of the ways the country has already been affected by the shutdown:
Volunteers have tried their best to keep the parks clean, spending hours removing litter and cleaning bathrooms, but they are fighting an uphill battle.
On Tuesday, the National Park Service announced that Joshua Tree National Park in California would temporarily close because unsupervised tourists had been damaging the park's land and its iconic Joshua trees.
The National Zoo and Smithsonian museums in Washington have also closed after initially remaining open until January 1. Even the zoo's beloved panda cam was not spared, going dark the morning after the zoo locked its gates.
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Transportation Security Administration employees have remained at work during the shutdown and are now set to miss their paychecks, which would normally be issued Friday. That has raised concerns that more TSA employees could call in sick to find alternative sources of income.
Some TSA employees are even taking the desperate step of quitting their jobs to find a guaranteed paycheck, Hydrick Thomas, president of the American Federation of Government Employees' TSA Council.
"Every day I'm getting calls from my members about their extreme financial hardships and need for a paycheck," Thomas said in a statement Tuesday. "Some of them have already quit and many are considering quitting the federal workforce because of this shutdown."
About 42,000 active-duty members of the Coast Guard have continued to work without pay because, unlike other military personnel, their agency is part of the Department of Homeland Security, which has seen its funding lapse. The Department of Defense, in contrast, will remain fully funded through September 2019.
Most of the Coast Guard's civilian workforce has been furloughed, leaving the active-duty members without their full network of support staff. Because of those limitations, the Coast Guard is providing only essential operations that protect life and property or national security, a spokesperson told NBC News.
The Department of Housing and Urban Development has been especially hard hit by the shutdown -- 95 percent of HUD employees are furloughed. With a skeleton staff and no funding, HUD has been unable to renew more than 1,000 contracts that provide federal subsides to landlords who own and operate Section 8 housing. Hundreds more contracts could expire if the shutdown continues into February. The situation could delay critical repairs and place poor families at risk of eviction, advocates and landlords say.
HUD has advised landlords to use reserve funds to cover costs until the shutdown ends and contracts can be renewed. For many landlords who own low-income housing buildings, that means limited funds to deal with building maintenance and emergencies that may arise.
The tens of millions of Americans on food stamps will receive their benefits for February, but that aid could be cut off if the shutdown continues into March.
Agriculture Secretary Sonny Perdue announced Tuesday that his department would issue February's benefits a little early to take advantage of a clause in the stopgap spending bill that expired in December that allows the government to distribute required payments within 30 days of the bill's expiration.
The food stamps program has only $3 billion in emergency reserves — not enough to pay for a full month's assistance — and because of the shutdown, the Department of Agriculture has no money to pay for the program in the ensuing months.
Daniel Barnes reports for NBC News, based in Washington.