The result is that Trump's initial budget wouldn't dent budget deficits projected to run about USD 500 billion.
White House budget officials outlined the information during a telephone call with reporters today given on condition of anonymity.
The budget officials on the call ignored requests to put the briefing on the record, though Trump on Friday decried the use of anonymous sources by the media.
Trump's defence budget and spending levels for domestic agency operating budgets will be revealed in a partial submission to Congress next month, with proposals on taxes and other programmes coming later.
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The senior budget official said there will be a large reduction in foreign aid and that most domestic agencies will have to absorb cuts.
He did not offer details, but the administration is likely to go after longtime Republican targets like the Environmental Protection Agency.
The tentative proposals for the 2018 budget year that begins October 1 are being sent to agencies, which will have a chance to propose changes.
In Congress, Democrats and some Republicans are certain to resist the cuts to domestic agencies, and any legislation to implement them would have to overcome a filibuster threat by Senate Democrats.
"It is clear from this budget blueprint that President Trump fully intends to break his promises to working families by taking a meat axe to programmes that benefit the middle class," said Senate Democratic leader Charles Schumer of New York.
"A cut this steep almost certainly means cuts to agencies that protect consumers from Wall Street excess and protect clean air and water."
The White House says Trump's budget also won't make significant changes to Social Security or Medicare.
The president told American governors at the White House today that "we're going to make it easier for states to invest in infrastructure" and that, overall, "we're going to do more with less and make the government lean and accountable to the people."
For Trump, the prime-time speech is an opportunity to refocus his young presidency on the core economic issues that were a centerpiece of his White House run.
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