A Senate session adjourned late on Sunday and a vote has been postponed to midday (05:30 GMT) on Monday.

Democratic and Republican senators have so far traded blame for the shutdown.

Democrats want President Trump to negotiate over immigration as part of a budget deal, but Republicans say no deal is possible while federal government services are closed.

Trump has called for a simple majority vote to end the impasse.

Under Senate rules, the bill needs 60 votes in the 100-member chamber to overcome blocking tactics by opponents.

The Republicans currently have 51 senators and would need some Democratic support to pass a budget.

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But Mr Trump said the "nuclear option" of a simple-majority vote was necessary.

The initial vote on a bill to fund the government until 8 February had been scheduled for 01:00 on Monday (06:00 GMT). But it was postponed as Sunday's session ended.

On Monday the closure of many federal services will be felt around the country and hundreds of thousands of federal staff face unpaid leave.

The last government shutdown was in 2013, and lasted for 16 days.

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