J.K. Rowling doesn't suffer fools.

This weekend,softcore movies Donald Trump adviser Roger Stone said some pretty disgusting things on Twitter.

Some he deleted, some he left up -- like this attack on Republican strategist and CNN contributor Ana Navarro.

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But he really became unhinged after someone questioned his assertion that Obama should be "charged, convicted and jailed" over the (totally unsupported) claims that the former president ordered an illegal wiretap on Trump during the campaign.

Famous writer and master of the Twitter takedown J.K Rowling used the opportunity to call Stone out for his gross, inexcusable insults.

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The Harry Potter author wasn't done. She later took the president to task for trying to distract from his ongoing Russia troubles.

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Rowling has been active on social media lately, using her magic tweeting powers to slam Piers Morgan and make fun of "he who must not be named" -- I'm talking about Donald Trump, of course.

Don't worry muggles of America. J.K. has your back.