The government shutdown has officially begun

The federal government officially entered a partial shutdown Saturday at midnight after the Senate adjourned Friday without passing a stopgap funding measure.

President Trump has said he will not sign a new spending bill unless it includes $5 billion for his promised expansion of the wall — now, per Trump's Twitter, "a Steel Slat Barrier which is totally effective while at the same time beautiful" — on the southern border. The House passed a bill honoring Trump's request, but it is not expected to pass the Senate.

Most federal agencies are already funded through September of 2019, so the shutdown will only affect seven Cabinet-level departments — Homeland Security, Transportation, Commerce, Interior, Agriculture, Housing and Urban Development, and Justice — as well as some independent agencies like NASA and the IRS.

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Some 420,000 employees of these agencies deemed "essential," like Forest Service firefighters and TSA agents, will continue to work without pay, while another 380,000 "non-essential" employees will be sent home without pay. Those who work through the shutdown are guaranteed to receive back pay when it is over, and the Senate passed a bill by unanimous consent Friday to guarantee back pay for furloughed workers as well.