WASHINGTON — President Donald Trump unveiled a $1.15 trillion budget Thursday, proposing a far-reaching overhaul of federal spending that would slash many domestic programs to finance a big increase for the military and make a down payment on a U.S.-Mexico border wall.

Trump's plan seeks to upend Washington with cuts to long-promised campaign targets like foreign aid and the Environmental Protection Agency as well as strong congressional favorites such as medical research, help for homeless veterans and community development grants.

“A budget that puts America first must make the safety of our people its number one priority — because without safety, there can be no prosperity,” Trump said in a message accompanying his proposed budget that was titled “America First: A Budget Blueprint to Make America Great Again.”

The $54 billion boost for the military is the largest since President Ronald Reagan's Pentagon buildup in the 1980s, promising immediate money for troop readiness, the fight against Islamic State militants and procurement of new ships, fighter jets and other weapons. The 10 percent Pentagon boost is financed by $54 billion in cuts to foreign aid and domestic agencies that had been protected by former President Barack Obama.

The budget goes after the frequent targets of the party's staunchest conservatives, eliminating the National Endowment for the Arts, legal aid for the poor, low-income heating assistance and the AmeriCorps national service program established by former President Bill Clinton.

Such programs were the focus of lengthy battles dating to the GOP takeover of Congress in 1995 and have survived prior attempts to eliminate them. Lawmakers will have the final say on Trump's proposal in the arduous budget process, and many of the cuts will be deemed dead on arrival. Mulvaney acknowledged to reporters that passing the cuts could be an uphill struggle and said the administration would negotiate over replacement cuts.

Mulvaney also went after GOP favorites, including aid to rural schools and health research, while eliminating subsidies for rural air service and the federal flood insurance program that's a linchpin for the real estate market, especially in coastal southern states and the Northeast.

Trump's GOP allies on Capitol Hill gave it only grudging praise, if any. “Congress has the power of the purse,” reminded House Appropriations Committee Chairman Rodney Frelinghuysen, R-N.J. “I look forward to reviewing this,” said House Speaker Paul Ryan, R-Wis.

“This is not a take-it-or-leave-it budget,” Mulvaney admitted.

Law enforcement agencies like the FBI would be spared, while the border wall would receive an immediate $1.4 billion infusion in the ongoing fiscal year, with another $2.6 billion planned for the 2018 budget year starting Oct. 1.

Trump repeatedly claimed during the campaign that Mexico would pay for the wall when, in fact, U.S. taxpayers will foot the bill.

Twelve of the government's 15 Cabinet agencies would absorb cuts under the president's proposal. The biggest losers are Agriculture, Labor, State, and the Cabinet-level EPA. The Defense Department, Department of Homeland Security and Department of Veterans Affairs are the winners.

More than 3,000 EPA workers would lose their jobs and programs such as Obama's Clean Power Plan, which would tighten regulations on emissions from power plants seen as contributing to global warming, would be eliminated. Popular EPA grants for state and local drinking and wastewater projects would be preserved, however, even as research into climate change would be eliminated.

Trump's proposal covers only roughly one-fourth of the about $4 trillion federal budget, the discretionary portion that Congress passes each year. It doesn't address taxes, Social Security, Medicare and Medicaid, or make predictions about deficits and the economy. Those big-picture details are due in mid-May, and are sure to show large — probably permanent — budget deficits. Trump has vowed not to cut Social Security and Medicare and is dead set against raising taxes.

“The president's going to keep his promises” to leave Social Security and Medicare alone, Mulvaney said.

But the budget increases user fees, boosting the airline ticket tax by $1 per one-way trip.

The so-called “skinny budget” is indeed skimpy, glossing over cuts to many sensitive programs such as community health centers, national parks, offering only a vague, two-page summary of most agencies, including the Pentagon, where allocating its additional billions is still a work in progress.