The UNAIDS program head has said millions more will die as a result of the sudden cuts to funding by the Trump administration. She also warned that the AIDS pandemic could return to 1990s levels.

The head of the United Nations program on HIV/AIDS, UNAIDS, said on Monday that over 6 million additional deaths from the disease are expected after the US slashed its funding.

UNAIDS executive director Winnie Byanyima said the sudden cuts from the US, which had been the biggest donor to the program, had been “devastating.”

“You’re talking of losing the gains that we have made over the last 25 years. It is very serious,” she told reporters in Geneva.