Trump's March 23 announcement came after a long and complicated process that he sparked with his July 26, 2017, tweets announcing that he would not allow transgender men and women to serve in the military.
The White House has followed through on Donald Trump's controversial pledge and formally banned transgender people from serving in the military. The White House said persons with a history or diagnosis of gender dysphoria - the medical diagnosis for those who receive treatment, often during their transition - are disqualified from serving except under "certain limited circumstances".
There is also an exception for people now in the military who were diagnosed with gender dysphoria between the implementation of an Obama-era policy allowing transgender people to serve and the start of the new Trump administration policy.
He has however allowed those transgenders who are already in the military to continue with their service.
"There is simply no way to spin it, the Trump-Pence Administration is going all in on its discriminatory, unconstitutional and despicable ban on transgender troops", said HRC President Chad Griffin.
In a memo to the president, dated February 22, Mattis cited "substantial risks" about military personnel who seek to change or who question their gender identity. Fast forward to present day, the policy recommendation has been finalized and Trump has quickly signed off on it, pending a congressional hearing. "This policy is not based on an evaluation of new evidence".
In a report to the president last month, the Department of Defense claimed that allowing people with a history of "gender dysphoria" to serve in the military could "undermine readiness" and "impose an unreasonable burden on the military" itself.
"This policy is a thinly veiled and feeble attempt by the Trump-Pence administration to justify the unnecessary discrimination of qualified patriots in order to advance their own personal agendas and in defiance of the administration's top military leadership".
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President's discrimination towards transgender people is well documented after he repealed Obama Administration's protection for transgender students.
Citing research into other countries that allow transgender people to serve, the study projected "little or no impact on unit cohesion, operational effectiveness or readiness" in the United States.
"(The Pentagon) will continue to assess and retain transgender service members", Pentagon spokesman Major David Eastburn said. Mattis recommends those diagnosed with gender dysphoria since Obama ended the Pentagon's ban on transgender troops in 2016 can continue to serve-though, again, they'll have to do so under the sex they were assigned at birth.
But rather than addressing that narrow issue, Trump opted to upend the entire policy on transgender service members.
Sanders said the new policy was announced after extensive study by senior leaders under the direction of defense secretary James Mattis.