President Donald Trump launched a fresh attack on his opponents ahead of a new effort in the bitterly divided US Congress to end a budget impasse before hundreds of thousands of federal workers are forced to start the workweek at home without pay.
The impact of the shutdown that began at midnight Friday has been largely limited so far, closing sites like New York's Statue of Liberty, but the effect will start to become acute if the stalemate runs into tomorrow.
Republicans and Democrats have traded bitter recriminations over who is to blame for the failure to pass a stop-gap funding measure by a January 20 deadline, a year to the day since Donald Trump took office as US president.
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He also encouraged the Senate's Republican leaders to invoke a procedural maneuver known as the "nuclear option" to change the chamber's rules to allow passage of a budget by a simple majority of 51 votes to end the shutdown. Senate leaders have been wary of such a move in the past, as it could come back to haunt them the next time the other party holds a majority.
"If stalemate continues, Republicans should go to 51 per cent (Nuclear Option) and vote on real, long term budget, no C R's!" he tweeted.
White House budget director Mick Mulvaney accused some Democrats of wanting to "deny the president sort of the victory lap of the anniversary of his inauguration" - echoing a complaint Trump made on Twitter the day before.
"There's other Democrats who want to see the president give the State of the Union during a shutdown," Mulvaney said on Fox, referring to the nationally televised address Trump is to deliver on January 30.
However, White House legislative director Marc Short told ABC that progress is being made, and Mulvaney also said there is a chance to have the government open before the workweek begins on Monday morning.
Late yesterday, top Senate Republican Mitch McConnell set a key vote for a funding measure for 1:00 am (local time) tomorrow, with both houses of Congress set to reconvene today.
"I assure you we will have the vote at 1:00 am on Monday, unless there is a desire to have it sooner," he said in a statement.
At the heart of the dispute is the thorny issue of undocumented immigration.
Democrats have accused Republicans of poisoning chances of a deal and pandering to Trump's populist base by refusing to fund a program that protects an estimated 700,000 "Dreamers" - undocumented immigrants who arrived as children - from deportation.
Trump, in return, has said Democrats are "far more concerned with Illegal Immigrants than they are with our great Military or Safety at our dangerous Southern Border."
The shutdown's effects meanwhile are set to intensify.
Essential federal services and military activity are continuing, but even active-duty troops will not be paid until a deal is reached to reopen the US government.
There have been four government shutdowns since 1990. In the last one, in 2013, more than 800,000 government workers were put on temporary leave.
"We're just in a holding pattern. We just have to wait and see. It's scary," Noelle Joll, a 50-year-old furloughed US government employee, told AFP in Washington.
A deal had appeared likely on Friday afternoon, when Trump - who has touted himself as a master negotiator - seemed to be close to an agreement with Democratic Senate leader Chuck Schumer on protecting Dreamers.
But no such compromise was in the language that reached Congress for a stop-gap motion to keep the government open for four more weeks while a final arrangement is discussed. And Republicans failed to win enough Democratic support in the Senate to bring it to a vote.
Congress reconvened for a rare yesterday session, where leaders of both sides were meant to hammer out their differences to prevent the shutdown from stretching into tomorrow. Instead, they traded accusations of responsibility for the shutdown.
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