A new vote is being held in the US House of Representatives among indications of a government shutdown beginning at midnight on Saturday.

Faced with a rebellion by fellow hard-line Republicans, House Speaker Kevin McCarthy is trying to secure agreement on a temporary 45-day respite. It’s not clear if the measure – stripped aid to Ukraine – will pass.

The fourth shutdown to occur over the past decade, it could affect everything from air travel to marriage licenses. Most government employees will be furloughed without pay, and crucial nutrition programmes will be halted.

It follows a hard-right revolt in the US House of Representatives. Republicans control the House by a slim majority, while Democrats hold the Senate by a single seat.

That means spending bills to keep the government open require buy-in from both parties in order to advance through both chambers to President Joe Biden’s desk.

On Saturday morning, Speaker McCarthy said he would put a 45-day continuing resolution (CR) plan to the floor – a stop-gap would keep federal agencies open until Congress can agree on a new funding bill.

The CR would include disaster relief funding, but would not include US foreign aid for Ukraine, which Democrats have been insisting on.

A rebel faction of right-wing Republicans has, so far, held up negotiations in the House, the lower congressional chamber, with a demand for significant cuts in spending, including a call for no more US funding of the war in Ukraine.

Receiving vocal support online from former President Donald Trump, the hard-liners have tanked efforts by Mr McCarthy to shepherd legislation needed to break the impasse through the House.

While the Speaker could ostensibly turn to Democrats for the votes he would need to approve a spending measure, it is a move that would likely trigger an effort by the rebel faction to oust him from his plum leadership post. McCarthy has also refused to take up a short-term funding bill making its way through the Senate. The bill, which includes $6bn (£4.9bn) for Ukraine and $6bn for disaster aid, is a last-ditch effort to avert a lengthy shutdown and appears to have strong bipartisan support in the upper chamber.

On Friday, House Republicans’ short-term funding measure, which included strict border policies championed by the hardliners, was rejected by as many as 21 members of the party and failed to pass.

In a closed-door meeting, Mr McCarthy said that Republicans would have to opt for the House bill or the Senate’s version, or risk being blamed for a shutdown. But the rebel lawmakers asserted they would not budge for anything less than a long-term spending bill with their priorities addressed. “This take it or leave it or I’ll blame you won’t work on us,” South Carolina Congresswoman Nancy Mace, a moderate who voted against the House bill on Friday, wrote on X. “I’m in this for the long run and have no problem taking on DC to do it.”