内容摘要：Elon Musk has said he is leaving the Trump administration after helping lead a tumultuous drive to shrink the size of US government that saw thousands of federal jobs axed.

Elon Musk has said he is leaving the Trump administration after helping lead a tumultuous drive to shrink the size of US government that saw thousands of federal jobs axed.

Bee Boileau, a research economist at IFS, said the Treasury faced "some unavoidably tough choices"."After turning on the spending taps last autumn, the flow of additional funding is now set to slow to more of a trickle," she said.

The government has committed to increasing spending on the army and its estates, and announced it would cut the foreign aid budget toof national income by 2027."Giving more to defence means, all else equal, bigger cuts to something else," the IFS said.

, freeing up billions for her to spend on long-term projects such as roads and energy infrastructure, but the IFS warned "not everything can be a priority for further increases".It said questions remained about "whether the trade-offs will be confronted rather than wished away".

Kiki McDonough, a jewellery designer and business owner, told the BBC's Sunday with Laura Kuenssberg programme that she believed savings could be made in the public sector.

"The civil service to me is completely overmanned, not working properly and I think if you went through it like a dose of salts and tried to find some savings, you could find a lot of savings," she said.These include 294 in national reserves, where limited commercial use of natural resources

And 29 in the more strictly controlled national parks, where business operations are officially not supposed to be permitted.Flavia Liberona is the executive director of Terram, a foundation that promotes sustainable development. In her hot and sticky office in an old building in the centre of Santiago she describes an environmental campaign that she's part of – Salvemos La Patagonia or Save Patagonia.

It wants to protect the natural habitat of the entire Chilean Patagonia region. This vast geographic area starts north of Puerto Montt and then extends all the way down to the very base of the country. And it is where most of the salmon farms are located, in its many fjords."We want the salmon farms to stop operating in the national parks and national reserves," says Ms Liberona.