More than 1,600 scientists signed a letter denouncing President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE administration’s plan to narrow the definition of gender to be strictly biological, according to Buzzfeed.

The letter was written in response to a memo reportedly drafted by the Department of Health and Human Services, according to the New York Times.

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The memo states that any disputes about a person’s sex would be clarified using genetic testing, which scientists who signed the letter called unscientific and unethical.

“This proposal is fundamentally inconsistent not only with science, but also with ethical practices, human rights, and basic dignity,” the scientists wrote.

Among the signatories are eight Nobel laureates.

The letter emphasizes that both biological sex and gender are on a spectrum and are not clear cut.

“Our best available evidence shows that affirmation of gender identity is paramount to the survival, health, and livelihood of transgender and intersex people,” the letter states.

More than 50 companies signed onto a statement released Wednesday supporting transgender equality.