In a series of early-morning tweets on Friday, Trump called on Senate majority leader Mitch McConnell to use a "nuclear option" to allow a Senate vote on legislation with a simple majority, rather than the standard "supermajority" of 60 votes.
The discord could impact nine of 15 Cabinet-level departments and numerous agencies and affect 800,000 government workers, The Associated Press reported. "This shutdown is totally unfair, completely unnecessary, and entirely the President's fault", she said. "You're not getting the wall today, next week or on January 3rd, when Democrats take control of the House".
With negotiations expected to resume, the House and Senate scheduled rare Saturday sessions. Special counsel Robert Mueller's office will remain open as well, because it is funded with a permanent indefinite appropriation, according to the agency's shutdown plan.
"The message comes after Trump said he wouldn't sign legislation Republicans had written because it didn't include enough money for a wall on the border with Mexico".
The US Postal Service will not be affected by the shutdown since it's an independent agency.
No one knew how long the closures would last.
For excepted employees, pay will come once the shutdown ends.
Trump this morning was focused on the shutdown, which impacts about one-fourth of federal operations, as well as his decision earlier in the week to pull USA troops out of Syria, a move that might have been the last straw for Defense Secretary James Mattis, who resigned soon after Trump announced the plan.More news: McLaren P1 GTR commemorates Senna's first championship
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Moments later, Rep. Matt Gaetz (R-Fla.), a vocal Freedom Caucus member who attended a lunch hosted by Mr. Trump at the White House on Saturday, contradicted the senator. Congress has a little bit of wiggle room as it has a weekend, followed by Christmas Eve - for which Trump has given federal workers a day off - and then Christmas Day.
"I am in the White House, working hard", tweeted the president, who canceled his Florida holiday getaway to his club Mar-a-Lago due to the shutdown.
Only a week ago, Trump said he would be "proud" to shut down the government, which Republicans now control, in the name of border security.
The shutdown comes at the end of a perilous week for the president, one that saw Defense Secretary James Mattis resign in protest after Trump's sudden decision to pull USA troops out of Syria.
Trump campaigned on tightening border security, building a border wall and halting illegal immigration. Those departments are: Agriculture, Commerce, Homeland Security, Housing and Urban Development, Interior, Justice, State, Transportation and Treasury. Federal workers considered essential must work through the shutdown, but neither they nor the furloughed workers would get paid until after the shutdown ends.
National parks also would close unless the government declares them essential. So, too, for employees of U.S. Customs and Border Patrol and Forest Service firefighters.
Roughly 420,000 federal employees will work without pay this week as the shutdown continues, and as many as an additional 380,000 will be furloughed, possibly indefinitely, according to some congressional estimates. Social Security checks were mailed, troops remained on duty and food inspections continued.