US President-elect Donald Trump (L) and Tesla and SpaceX CEO Elon Musk watch a fight during UFC 309 at Madison Square Garden in New York, on November 16, 2024. Kena Betancur, AFP/File

Elon Musk, who has been tasked by President-elect Donald Trump to lead a government efficiency commission, has acknowledged his goal of slashing federal spending would be tricky -- now eyeing $1 trillion in cuts, half his original goal.

On Trump's campaign trail, Musk vowed to lower federal spending by $2 trillion, a whopping 30 percent cut from 2024.

But the world's richest person said in a discussion streamed online Wednesday evening: "We'll try for $2 trillion. I think that's like the best case outcome."

"If we try for $2 trillion, we've got a good shot at getting one," he added, while speaking with political strategist Mark Penn.

Musk, who is one of Trump's closest allies, was named head of a newly created Department of Government Efficiency -- dubbed DOGE -- along with businessman Vivek Ramaswamy after last year's election. Neither of them has experience in government.

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Although the office has an advisory role, Musk's star power and strong influence in Trump's inner circle bring political clout.

Musk's goal was to cut $2 trillion goal in spending from the government's $6.8 trillion budget.

But this almost certainly meant devastation of social support programs, something that has never garnered strong political backing.

Around two-thirds of federal spending goes towards programs that Trump would not be able to cut, or those he has pledged not to, including Social Security and Medicare.

On Wednesday evening, Musk also suggested lowering the budget deficit from around $2 trillion to $1 trillion.

Musk and Ramaswamy have said they can identify billions of dollars of spending cuts, sparking questions about whether Republicans might attempt to slash politically popular social security programs.

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© Agence France-Presse