MIDNIGHT EST Update:
Congress has missed the deadline for averting the first partial government shutdown in 17 years.
As the clock struck midnight Monday, House Republicans were demanding that the Senate negotiate their demand for a one-year delay in making millions of people buy health insurance under President Barack Obama's 2010 health care law. Minutes before midnight, the White House ordered a shutdown.
The Democratic Senate on Monday twice rejected GOP demands to delay key portions of what has become to known as Obamacare as a condition for keeping the government open.
An estimated 800,000 federal workers faced furloughs though many were told work a half day Tuesday. Critical functions like air traffic control and military operations will continue. Social Security benefits will be paid. National parks and most federal offices will close.
Original from Earlier:
The White House's budget office says it's notifying federal agencies that the government will shut down Tuesday.
Sylvia Mathews Burwell, the director of the White House Office of Management and Budget, said late Monday in a memorandum to agency heads that there was no indication Congress would approve a short-term funding measure before the midnight deadline. She said federal agencies should execute their plans for an orderly shutdown.
Burwell said the Obama administration urged Congress to move quickly so critical government services could be restored. She said a shutdown affects hundreds of thousands of workers who will be sent home and inconveniences millions who rely on federal services.
She said some critical functions, like the military and air traffic control, would remain open.