WASHINGTON — The Trump administration plans to reinstate in full a program that provides local police departments with military surplus equipment such as large-caliber weapons and grenade launchers, according to a document obtained by The New York Times.

Attorney General Jeff Sessions is expected to announce the changes to the program on Monday when he speaks at a Fraternal Order of Police conference in Nashville. It was not immediately clear why Mr. Sessions would announce changes to a Pentagon program, but he has rolled back several Obama-era policing reforms and helped bolster the Trump administration’s support among law enforcement.

President Barack Obama put limits on the program in 2015, when several high-profile cases of police officers killing black men inflamed tensions between law enforcement and local communities.

The shooting death of 18-year-old Michael Brown in Ferguson, Mo., in 2014 by a white police officer triggered protests and a heavily armed police response that many in the community saw as unnecessary. Images of the police with sniper rifles on top of armored cars or wearing riot gear to watch over protests set off a debate about whether police departments had lost sight of their missions to serve and protect.