White House budget director Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE sent agencies a memo on Saturday directing government agencies to conduct an "orderly shutdown" after the Senate failed to reach a deal to fund the government.

"Agencies should now execute plans for an orderly shutdown due to the absence of appropriations," the letter said.

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"We urge Congress to act quickly to pass a continuing resolution and to restore the operation of critical public services and programs that will be impacted by a lapse in appropriations," it continued.

The Office of Management and Budget (OMB) said it would offer agencies additional guidance as appropriate.

The government shutdown began early Saturday after senators missed the midnight deadline to reach an agreement on funding.

OMB said on Friday that the administration was aiming to lessen the effects of a shutdown, and pointed out that the impact of the shutdown will not necessarily be felt immediately due to it beginning on a Saturday.

Mulvaney said the Transportation Security Administration, parks and post offices will remain open through the shutdown.

Other agencies, such as the Federal Communications Commission, will remain open for a few days due to additional funding.

However, hundreds of thousands of federal employees that are considered “nonessential” either won't be allowed to report to work on Monday or will show up briefly to prepare their offices for the furlough.

Federal courts only have enough money to remain open until Feb. 9 and the Food and Drug Administration will be unable to conduct food safety inspections.