Elon Musk keeps tweeting the 'R-word.' Disability advocates say he needs to stop.

Elon Musk has the ear of one of the most powerful people in the world – President Donald Trump – making him one of the most powerful people in the world, too. He's been given unfettered access to adjust the federal government's budget and headcount.

So what's he doing posting a slur multiple times targeting the disabled community on social media?