Hundreds of thousands of federal workers are unable to report for work throughout today, as the US Senate struggles to end a government shutdown.
Some will not be paid until the stalemate is resolved.
A vote to end the shutdown was postponed until later today, meaning many federal government offices will not open.
Under Senate rules, the bill needs 60 votes in the 100-member chamber.
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.
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 shutdown came as a result of failure by lawmakers to agree on a spending bill at midnight on Friday.
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 late on Sunday.