The majority of federal workers will be unable to report for work on January 22, as the Senate struggles to end a government shut-down.
Some will not be paid until the stalemate is resolved.
On January 21, a rare Sunday session of the Senate yielded no agreement between Democrats and Republicans, with immigration one of the main sticking points.
Essential services will still run but famous sites such as the Statue of Liberty have already been affected.
The monument was closed on January 21, but New York Governor Andrew Cuomo said he would dip into state funds to pay the daily employment bill and reopen the popular tourist site.
It missed a deadline. At midnight on January 19, lawmakers failed to agree on a spending bill. The bill was not a plan for funding for the whole of 2018, but would have kept things running until the middle of next month.
Democrats refused to back a temporary deal until their concerns on immigration reform were dealt with.
Efforts to reach a compromise ahead of the working week failed on January 21.
A vote to end the shutdown was postponed until midday on January 22, meaning many federal government offices will not open and the shutdown enters its third day.
Under Senate rules, the bill needs 60 votes in the 100-member chamber.
The Republicans currently have 51 senators, so they need some Democratic support to pass a budget.
Democrats want President Donald Trump to negotiate over immigration as part of a budget deal, but Republicans say no agreement is possible while federal government services are closed.
Republicans want funding for border security – including a proposed border wall with Mexico – and immigration reforms, as well as increased military spending.
On January 20, President Trump said the “nuclear option” of a simple majority vote was necessary to end the impasse.
It means no pay for those federal employees who are “furloughed” – on unpaid leave – even though their workplaces are not open.
Most staff in the departments of housing, environment, education and commerce will be staying at home on January 22. Half of workers in the treasury, health, defense and transportation departments will also not be going to work.
Visa and passport processing could be delayed.
However, essential services that protect “life or human property” will continue, including national security, postal services, air traffic control, some medical services, disaster assistance, prisons, taxation and electricity generation.
Meanwhile, the Trump administration said it planned to keep national parks open – their closure in the 2013 shutdown provoked an angry public reaction.
The shutdown began on the first anniversary of President Trump’s inauguration. His trip to the World Economic Forum in Davos, Switzerland, has also been called into question.
The last government shutdown was in 2013, and lasted for 16 days.
It cost the government $2 billion in lost productivity and led to “significant negative effects on the economy”, the OMB said at the time.
This is the first time a government shutdown has happened while one party, the Republicans, controls both Congress and the White House.
January 19 vote fell 50-49, far short of the 60 needed to advance the bill. This is due to a number of key disagreements.
Democrats have demanded protection from deportation of more than 700,000 undocumented immigrants who entered the United States as children.