President Donald Trump is reviving his border wall fight, preparing a new budget that will seek $8.6 billion for his signature project, impose steep spending cuts to other domestic programs and set the stage for another fiscal battle.

Budget documents like the one Trump is releasing Monday are often seen as just a starting point of negotiation. Fresh off the longest government shutdown in history, Trump's 2020 proposal shows he is eager to confront Congress again to boost defense spending and cut $2.7 trillion in nondefense spending over a decade.

Titled "A Budget for a Better America: Promises Kept. Taxpayers First," Trump's proposal "embodies fiscal responsibility," said Russ Vought, the acting director of the Office of Management and Budget.

Vought said the administration has "prioritized reining in reckless Washington spending" and shows "we can return to fiscal sanity."

Speaking on CNBC Monday, Vought confirmed that the $8.6 billion border request was part of Trump's spending blueprint for the 2020 budget year, which begins Oct. 1. It would pay for hundreds of miles of new barriers along the U.S.-Mexico border.

Vought said "the border situation is deteriorating by the day" with "record numbers of apprehensions."

An administration official said Trump's budget proposes increasing defense spending to $750 billion — and standing up the new Space Force as a military branch — while reducing nondefense accounts by 5 percent, with cuts recommended to safety-net programs used by many Americans.