(Reuters) - U.S. President Donald Trump said on Monday that transgender issues were in flux and he aims to protect the country after a report that his administration was considering defining gender as male or female based on genitalia at birth drew widespread condemnation.

"We have a lot of different concepts right now. They have a lot of different things happening with respect to transgender right now," Trump said amid a protest outside the White House and outpouring of criticism on social media about the proposal.

Asked about a campaign promise to protect the LGBT community, Trump said: "I'm protecting everybody. I want to protect our country."

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Under a proposal first reported by the New York Times on Sunday, the Trump administration would narrow the definition of gender to male or female at birth and it would be unchangeable later in life.

The move would remove recognition of and protections for transgender people under U.S. civil rights laws promoted by the prior administration of President Barack Obama in health care, schools and the military.

About 1.4 million U.S. adults identify as transgender, according to a 2016 estimate by the Williams Institute, a research center at UCLA Law School focused on sexual orientation and gender identity law and public policy.

The reported proposal comes little more than a week after New York City created a gender-neutral "X" option for birth certificates, joining California, Oregon, Washington state and New Jersey in offering a third gender category on the government-issued identity documents.

Related Coverage VIDEO Trans activists fight Trump plan to roll back rights

Medical experts said on Monday that defining gender based on genitalia at birth is scientifically inaccurate and may harm patients' health.

Dr. Joshua Safer, executive director of Mount Sinai Hospital's Center for Transgender Medicine and Surgery, said the Trump administration's definition is "not consistent with current western medicine or science in terms of how we actually operate or define sex of individuals."

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"Sex of individuals is not correlated always with their genitals at birth, or with their chromosomes," said Safer, who also serves as president of the United States Professional Association for Transgender Health.

Transgender rights activists protest the government's alleged attempt to strip transgender people of official recognition at the White House in Washington, U.S., October 22, 2018. Reuters/Kevin Lamarque Transgender rights activists protest the government's alleged attempt to strip transgender people of official recognition at the White House in Washington, U.S., October 22, 2018. Reuters/Kevin Lamarque Transgender rights activist protest the government's alleged attempt to strip transgender people of official recognition at the White House in Washington, U.S., October 22, 2018. Reuters/Cathal McNaughton Transgender rights activists protest the government's alleged attempt to strip transgender people of official recognition at the White House in Washington, U.S., October 22, 2018. Reuters/Kevin Lamarque Transgender rights activists protest the government's alleged attempt to strip transgender people of official recognition at the White House in Washington, U.S., October 22, 2018. Reuters/Kevin Lamarque A Transgender rights activist protests the government's alleged attempt to strip transgender people of official recognition at the White House in Washington, U.S., October 22, 2018. Reuters/Cathal McNaughton

Most transgender people live with a profound sense that the gender assigned to them at birth was wrong and transition to the opposite sex, while others live a non-binary or gender-fluid life.

"We urge the administration to ensure all public health policy is firmly rooted in science, and to keep discrimination and political interference out of our nation’s health,” said Dr. Lisa Hollier, president of the American College of Obstetricians and Gynecologists.

Beyond the broader issues raised by the administration memo, doctors said the new policy would be impossible to apply to "intersex" babies who are born with ambiguous genitalia or reproductive organs.

"Trump's definition does not even take this entire group of patients into consideration," said Dr. Natasha Bhuyan, a family medicine and LGBT care specialist in Phoenix.

If the administration's recommended definition is adopted, these patients will likely be assigned a male or female sex at birth, which can have devastating long-term psychological and health consequences, she said.

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