WASHINGTON — President Trump is expected to propose on Monday a $4.8 trillion budget that will include billions of additional dollars for his wall along the southern border and steep cuts to safety net programs like Medicaid, disability insurance and housing assistance, according to senior administration officials and documents reviewed by The New York Times.

The final budget proposal of Mr. Trump’s term is expected to reinforce the anti-immigration platform that helped propel him into office and will be a big part of his re-election campaign. Mr. Trump intends to ask Congress for an additional $2 billion to fund his border wall, according to people familiar with the plan, pressing ahead with one of his signature campaign pledges and setting up another clash with Democrats.

The White House budget is generally viewed as a political messaging document. Congress, which is responsible for approving government spending, is under no requirement to adhere to White House requests. Lawmakers have previously rejected many of Mr. Trump’s attempts to gut domestic programs.

But this year’s budget will serve as a blueprint for Mr. Trump’s priorities if he wins a second term. And some of the proposals can be achieved without the approval of Congress.