Commerce Department Inspector General Peggy Gustafson

Updated at 9:34 p.m. ET

The U.S. Census Bureau has halted all work on President Trump's directive to produce a state-by-state count of unauthorized immigrants that would have been used to alter a key set of census numbers, NPR has learned.

Senior career officials at the bureau instructed the internal team assigned to carry out Trump's presidential memo to stand down and cease their work immediately on Tuesday night, according to a bureau employee who spoke to NPR on the condition of anonymity out of fear of retaliation in the workplace for speaking out.