WASHINGTON — President Donald Trump’s administration warned on Tuesday of no guaranteed back pay for federal workers during a government shutdown, reversing what has been long-standing policy for some 750,000 furloughed employees, according to a memo being circulated by the White House.

Trump signed into law after the longest government shutdown in 2019 legislation to ensure federal workers receive back pay during any federal funding lapse. But in the new memo, his Office of Management and Budget says back pay must be provided by Congress, if it chooses to do so, as part of any bill to fund the government.

The move by the Republican administration was widely seen as a strong-arm tactic — a way to pressure lawmakers to reopen the government, now in the seventh day of a shutdown.

“There are some people that don’t deserve to be taken care of, and we’ll take care of them in a different way,” Trump said during an event at the White House.

He said back pay “depends on who we’re talking about.” Asked a second time about backpay for furloughed federal workers given that the requirement is spelled out in law, Trump said: “I follow the law, and what the law says is correct.”

Refusing retroactive pay to the workers, some of whom must remain on the job as essential employees, would be a stark departure from norms and practices and almost certainly would be met with legal action.

While federal workers — as well as service members of the military — have often missed paychecks during past shutdowns, they are almost always reimbursed once the government reopens.