Caitlyn Jenner has criticized President Donald Trump's decision to reverse Barack Obama's transgender bathroom directive.
The Olympian released a video addressing the president by saying she had a message 'from one Republican to another'.
Jenner, who appeared to support Trump in the race for the White House, said: 'This is a disaster. You made a promise to protect the LGBTQ community. Call me.
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Trump's administration announced on Wednesday that it lifted federal guidelines that said transgender students should be allowed to use public school bathrooms and locker rooms matching their gender identity.
As proof the Supreme Court will soon hear a very important Title IX case, thanks to the courage of a very brave young man, Gavin Grimm.
'Mr. President, we'll see you in court.'
Grimm is a female-born transgender high school student who was mentioned by actress Laverne Cox at the Grammy Awards.
The Supreme Court will hear Grimm's case on March 28, and determine whether he will be allowed to use the boys' bathroom at Gloucester High School in Virginia under Title IX, the federal law prohibiting gender-based discrimination.
If the court rules in favor of Grimm, the decision will become the law of the land, binding the Trump administration and the states.
Well @realDonaldTrump, from one Republican to another, this is a disaster. You made a promise to protect the LGBTQ community. Call me. pic.twitter.com/XwYe0LNUOq
— Caitlyn Jenner (@Caitlyn_Jenner) February 24, 2017
Jenner ended her video by saying: 'Finally I have a message for President Trump, from, well, one Republican to another. This is a disaster. And you can still fix it. You made a promise to protect the LGBTQ community. Call me.'
After Trump said in April that transgender people should be able to use whatever bathroom they choose, Jenner filmed herself going into the women's bathroom at New York's Trump International Hotel and Tower.
Jenner later went on to praise Trump for being 'very much behind the LGBT community' in a chat with STAT last June.
The 67-year-old transgender reality star initially supported Republican presidential candidate Ted Cruz.
But in an March 2016 episode of I Am Cait, Jenner said she would vote for Trump without a moment's hesitation if she had to choose between him and Hillary Clinton in the general election.
While daughter Kim Kardashian revealed Jenner was voting for Trump in an interview with Wonderland magazine, the 67-year-old tried to say she hadn't 'outwardly supported anybody' in the race.
Jenner spoke at the Republican National Convention in July and attended the Liberty Ball at Trump's inauguration.
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The Justice and Education departments said Wednesday that public schools no longer need to abide by the Obama-era directive instructing them to allow transgender students to use bathrooms and locker rooms of their chosen gender.
That guidance, issued in May, led to a spate of lawsuits over how it should be applied, according to a letter from the departments being sent to schools nationwide.
The agencies said they withdrew the guidance to 'in order to further and more completely consider the legal issues involved.'
Anti-bullying safeguards for students will not be affected by the change, according to the letter.
But advocates of protections for transgender teens said the overall rollback sends 'a message that something is wrong with them, which is harmful,' said Nancy Haque, co-executive director of Basic Rights Oregon.