Jackie Evancho, who sang the US national anthem at President Donald Trump's inauguration last month, has asked him to sit down with her and her transgender sister to learn about the challenges for students struggling with gender identity.
Ms Evancho, 16, requested the meeting in a public Twitter message to the president late on Wednesday, minutes after his administration revoked landmark guidance to public schools to let transgender students use the bathrooms of their choice.
"I am obviously disappointed in the @POTUS decision to send the #transgender bathroom issue to the states to decide. #sisterlove," she wrote from her account, @jackieevancho.
Mr Trump "gave me the honor" of singing at the inauguration, she added. "Pls give me & my sis the honor 2 meet with u 2 talk #transgender rghts."
The White House had no immediate comment.
More than 7000 Twitter users have liked the request by Ms Evancho, a classical crossover singer who rose to fame on the TV show America's Got Talent.
Ms Evancho was the first performer announced for Mr Trump's inauguration ceremony, an event that many other entertainers had shunned because of the president's views.
Mr Trump, an enthusiastic Twitter user, has not responded to the request, Ms Evancho said on Thursday during an appearance with her sister, Juliet, on ABC's Good Morning America.
"I just want to enlighten him on what my sister - I've seen her go through every single day in school," she said.
Juliet Evancho, a high school senior, said the president needed to know about the threats facing students who identify as a gender other than the one they were born with.
The Evancho family is suing Juliet's Pittsburgh-area school district over her right to use women's bathrooms.
The Trump administration's action on Wednesday reversed a signature initiative of former president Barack Obama, whose Justice and Education departments had threatened to withhold funding for schools that did not comply with its guidance.