J.K. Rowling calls Trump a 'tiny, little man' for shoving a foreign leader

In what is now the natural order of things, Donald Trump made a mistake and J.K. Rowling tweeted about it.

On Thursday, President Donald Trump -- currently in Brussels attending the NATO Summit -- appeared to shove Montenegro's Prime Minister Dusko Markovic while making his way to the front of a small crowd. Later the White House reportedly defended the gesture as a "casual greeting" between leaders.

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Naturally, author J.K. Rowling -- ever ready to offer her take on current affairs -- read Trump's gesture as aggressive, and called him out for it on Twitter.

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Rowling has long made vocal her issues with Trump, and regularly spars with his most fervent supporters online. The lesson: Don't cross Rowling via Twitter unless you're prepared for a highly public response. That is, unless you're Trump -- she's coming for you either way.