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Hillary Clinton intended to convey a message about her support of universal background checks for firearms purchases — perhaps to distinguish her stance from Republican Donald Trump on the day he picked up the endorsement of the National Rifle Association.

Instead, the Democratic presidential frontrunner became the butt of jokes on Twitter, among those who know a thing or two about Venn diagrams.

It started earlier in the day, when Clinton tweeted this:

Dear Congress,



Let's get this done.



Thanks,



The vast majority of Americans pic.twitter.com/23ND36tFFm — Hillary Clinton (@HillaryClinton) May 20, 2016

Math nerds immediately seized on the incongruity: All the gun owners -- including the smaller number who favor universal background checks — are Americans. Clinton's Venn diagram seems to suggest otherwise.

Some dubbed the gaffe a "datastrophe."

Others turned to Twitter to demonstrate their command of elementary school math concepts (or superior intellect, you pick) by fixing Clinton's graphic.

We fixed Hillary Clinton's terrible Venn diagram on gun control https://t.co/bySqilp1VO pic.twitter.com/M6656IxTeP — Chris Cillizza (@TheFix) May 20, 2016

Clinton opponents, naturally, seized the opportunity to take a swipe, as well.

Trump has yet to weigh in on the topic.