Senior officials at the US Department of Veterans Affairs have ordered that VA physicians and scientists not publish in medical journals or speak with the public without first seeking clearance from political appointees of Donald Trump, the Guardian has learned.

The edict, laid down in emails on Friday by Curt Cashour, the VA’s assistant secretary for public and intergovernmental affairs, and John Bartrum, a senior adviser to VA secretary Doug Collins, came hours after the prestigious New England Journal of Medicine published a perspective co-authored by two pulmonologists who work for the VA in Texas.

The article warned that cancelled contracts, layoffs and a planned staff reduction of 80,000 employees in the nation’s largest integrated healthcare system jeopardizes the health of a million veterans seeking help for conditions linked to toxic exposure – ranging from Vietnam veterans exposed to Agent Orange to veterans of Iraq and Afghanistan who developed cancer after being exposed to smoke from piles of flaming toxic waste.