Caitlyn Jenner, who once praised then candidate Donald Trump after making a pit stop in the ladies' room at Trump Tower, now would like to have a word with him.

"This is a disaster," Jenner said in a message posted via Twitter. The Olympic athlete and reality star, who began life as Bruce Jenner and fathered six children, was referring to the Trump administration's lifting of Obama-era guidelines geared toward transgender students.

"For the bullies: you're sick. Because you're weak you pick on kids, you pick on women or anyone else you think is vulnerable," Jenner says in the message. "Apparently even becoming Attorney General isn't enough to cure some people of their insecurities."

Jenner then referenced the case of Virginia teen Gavin Grimm, who was born a girl but identifies as a boy, and sued to use a boys' bathroom. Grimm has been issued an amended birth certificate identifying him as a male, has received hormone treatments and underwent chest reconstruction surgery.

During the campaign, Jenner posted a video after visiting the Trump Tower ladies room and now has a bone to pick.

"I have a message for President Trump: From one Republican to another,"  Jenner says. "You made a promise to protect the LGBTQ community. Call me."