The Trump administration is canceling funding for the U.S. Global Change Research Program, the entity that produces the federal government’s signature climate change study, according to three federal officials familiar with the move.

The move, which had been widely expected, is a potentially fatal blow to the National Climate Assessment, the study that Congress mandated under the Global Change Research Act of 1990 be issued every four years to ensure the government understands the threats that rising temperatures pose and what is driving climate changes. The report is the U.S. government’s most comprehensive look at climate change and serves as a crucial guide to state and community efforts to prepare for the effects.

The officials said NASA has canceled the contract with consulting firm ICF International, which coordinates the U.S. Global Change Research Program and the 13 federal agencies that write the National Climate Assessment.