The Trump Shutdown..!! US Goverment halts..!!
The US Senate is due back in session to try to end a budget impasse before the start of the working week when the shutdown of many federal services will be felt around the country.
Hundreds of thousands of federal staff face the prospect of unpaid leave.
On Saturday, recriminations flew around over the Senate's failure to pass a new budget and prevent the shutdown.
A bill to fund the federal government for the coming weeks did not receive the required 60 votes by Friday.
The Republican leader of the US Senate, Mitch McConnell, has said there will be a vote at 01:00 in the early hours of Monday (06:00 GMT) on a bill to fund the government until 8 February.
The last government shutdown was in 2013, and lasted for 16 days.
What is a government shutdown?
The US budget must be approved by 1 October - the start of the federal financial year.
But Congress has often failed to meet this deadline and negotiations continue well into the new year, with the previous year's funding to federal agencies extended on a temporary basis.
Because Congress failed to agree an extension that would have maintained government funding through to 16 February, it means many federal agencies effectively closed for business as of 00:01 on Saturday (05:01 GMT).
Most staff in the departments of housing, environment, education and commerce will be staying at home on Monday. Half of workers in the treasury, health, defense and transportation departments will also not be going to work.
Visa and passport processing could also be delayed, and some national monuments, including New York's Statue of Liberty, have already been closed.
But essential services that protect "life or human property" will continue, including national security, postal services, air traffic control, inpatient medical services, emergency outpatient medicine, disaster assistance, prisons, taxation and electricity generation.
And the Trump administration said it planned to keep national parks open - their closure in the 2013 shutdown provoked an angry public reaction.
Why the US government has shut down
The shutdown began on the first anniversary of President Trump's inauguration. His trip to the World Economic Forum in Davos, Switzerland, next week has also been called into question.
What happened during the 2013 shutdown?
Many federal employees were forced to take a leave of absence - officially known as being furloughed - during the 16 days of shutdown.
At its peak, some 850,000 employees were off work each day. It cost the government $2bn in lost productivity and led to "significant negative effects on the economy", the OMB said at the time.
Donald Trump, interviewed by Fox and Friends at the time, laid the blame for the shutdown with the then president, Barack Obama.
Federal workers cannot get paid for days worked during a lapse in funding. In the past, however, they have been repaid retroactively even if they were ordered to stay at home.
