The grammar police on Saturday trolled President-elect Donald Trump for misspelling the word “unprecedented” as “unpresidented,” in a tweet about China taking a Navy drone in international waters.

Good morning! The #WordOfTheDay is...not 'unpresidented'. We don't enter that word. That's a new one. https://t.co/BJ45AtMNu4
— Merriam-Webster (@MerriamWebster) December 17, 2016

Trump swiftly deleted the tweet and replaced it with one using the correct spelling. But the Twitter account for the Merriam-Webster dictionary, the standard-bearer for English-language words, had already poked fun at Trump’s grammar mistake.

“Good morning! The #WordOfTheDayis...not 'unpresidented'. We don't enter that word. That's a new one,” the company tweeted.

Trump, a Republican and prolific tweeter with 17.4 million followers, has had spelling mistakes in previous tweets.

Connecticut Democratic Sen. Chris Murphy also pounced on Twitter.

An error occurred while retrieving the Tweet. It might have been deleted.

“This is madness. A 7:30am Saturday escalation of diplomatic crisis w China via Twitter, w misspelling,” he posted.