Washington ? President Bush’s budget will propose slashing grants to local law enforcement agencies and cutting spending for environmental protection, American Indian schools and home-heating aid for the poor, The Associated Press learned Saturday.

Bush molded the roughly $2.5 trillion spending plan for 2006 as a response to a string of record federal deficits, and is sends it to Congress on Monday.

The budget, the toughest he has written since entering the White House four years ago, seeks about half the increase for school districts in low-income communities he requested last year and a slight reduction for the National Park Service.

Many proposals face an unclear fate in Congress, where members of both parties are sure to defend favorite initiatives. Democrats blame the cuts on the tax reductions Bush has enacted and say other items his budget omits — a Social Security overhaul and costs for wars in Iraq and Afghanistan — will only make matters worse.

“What it will lead to is growing pressure for draconian cuts,” Sen. Kent Conrad of North Dakota, the Senate Budget Committee’s top Democrat, said Saturday. “It’s inescapable. The course he’s led us on, whether it’s this year or next year, is for very, very heavy cuts.”

Bush has said his budget will assemble federal resources for war, domestic security and other priorities and cull inefficient or redundant programs. Administration officials have said he will hold overall nondefense spending — excepting domestic security — to less than next year’s expected 2.3 percent increase in inflation, meaning the programs will lose purchasing power.

The details obtained Saturday are the latest in a budget that will also seek savings from programs ranging from Amtrak and farmers’ subsidies to Medicaid, the federal-state health program for the poor and disabled.

He would eliminate the $300 million the government gives to states for incarcerating illegal aliens who commit crimes. It’s a proposal he has made in the past and one that Congress has ignored. Also gone would be assistance for police departments to improve technology and their ability to communicate with other agencies.