American political leaders failed to reach agreement on ending the US government shutdown on Sunday night, postponing a planned vote until midday on Monday.
It means federal agencies and services will remained closed when the working week begins.
Hopes had grown during Sunday that a deal might be within reach after about two dozen Republican and Democratic moderates met to discuss immigration issues.
However, with both sides blaming the other for the shutdown Senate leaders decided to abandon plans for a 1am vote.
Mitch McConnell and Chuck Schumer, respectively the Republican and Democratic leaders in the Senate, said negotiations continued.
“It would be my intention to proceed to legislation that would address Daca, border security and related issues,” said Mr McConnell, referring to the status of immigrants who arrived illegally as children.
“It is also my intention to take up legislation on increased defence spending, disaster relief and other important matters.”
Mr Schumer said: "We have yet to reach an agreement on a path forward."
Democrats have blocked a House-passed temporary funding bill to reopen the government's doors until February 16 as they push for protection for 700,000 undocumented immigrants who entered the US as children.
Democrats are holding our Military hostage over their desire to have unchecked illegal immigration. Can’t let that happen!— Donald J. Trump (@realDonaldTrump) January 20, 2018
While the two sides feuded, signs of the shutdown were evident at national parks and at some agencies.
Thousands of visitors to New York were disappointed to find they could not visit the Statue of Liberty, although it is due to reopen on Monday after the state said it would pick up the cost of paying staff.
Democrats have blamed Donald Trump and his party's leadership for incompetence. But Republicans are becoming increasingly confident that opposition to the funding deal is wavering.
Lindsey Graham, senator for South Carolina, said: "To my Democratic friends, don't overplay your hand.
"A government shutdown is not a good way to get an outcome legislatively."