Mama bear is pissed!

Melania Trump has hired a famous lawyer to go after the creator of a YouTube video suggesting her 10-year-old son Barron is autistic, and Donald's wife is also pointing the finger at Rosie O'Donnell for being a bully, after the TV host tweeted out the clip last week.

"The video allegedly seeks to 'stop the bullying' of Barron Trump. Not true ... The video did instigate further bullying by Rosie O'Donnell and others," the legal letter reads.

The Trumps emphatically deny their son has autism, but the video shows various clips of him exhibiting tell-tale signs of the condition like clapping of the hands. Melania's attorney, Charles J. Harder, says Barron clapped his hands oddly once, but that "the vast majority of the time, he claps normally," according to documents obtained by TMZ. We can't believe how low people can stoop!

Although she's not directly suing O'Donnell, Melania wants the creator of the video to take it down and issue an apology... or else!

You can have your personal gripes with the President Elect, but going after his middle schooler is totally disgusting. Team Melania on this one!