President Donald Trump has a proclivity for tweeting, typos and trenchant nicknames and the president took aim at California's Democrat congressman Adam Schiff, who is the incoming chairman of the House Intelligence Committee.

Mr Schiff has said his party would investigate Mr Trump’s acting attorney general, Matthew Whitaker, who is charged with overseeing the Russia investigation led by special counsel Robert Mueller.

“So funny to see little Adam Schitt (D-CA) talking about the fact that Acting Attorney General Matt Whitaker was not approved by the Senate, but not mentioning the fact that Bob Mueller (who is highly conflicted) was not approved by the Senate!” Mr Trump tweeted.

The post quickly set off reactions on social media, as some critics assumed the president had deliberately misspelled the congressman’s name to make it sound like a vulgarity.

“The Office of the President was made for better things than an infantile tweet misspelling a congressman’s name like a curse word,” tweeted Walter M Shaub Jr, the former top ethics watchdog for the federal government who resigned last year after going head-to-head with the Trump administration.

Mr Schiff himself also fired back. “Wow, Mr President, that’s a good one. Was that like your answers to Mr Mueller’s questions, or did you write this one yourself?” he wrote, referring to Mr Trump’s lawyers drafting written answers to some of Mr Mueller’s questions.

The White House did not immediately respond to a request for comment on Sunday evening: Was it a nickname? A typo? Both?

History offers little guidance.

Mr Trump has an uncanny ability to brand rivals with unflattering nicknames, from “Crooked Hillary” (Hillary Clinton) to “Lyin’ Ted” (Senator Ted Cruz) and “Pocahontas” (Senator Elizabeth Warren).

Trump says written responses to questions will go to Mueller team next week

Using the word “little” before the names of his opponents is a go-to tactic. He has even used the phrase on Schiff in the past: “Little Adam Schiff, who is desperate to run for higher office, is one of the biggest liars and leakers in Washington,” the president tweeted this year. Inexplicably, he has also called him “Liddle’ Adam Schiff.”

But Mr Trump is also known for typos and spelling errors in his tweets.

People have caught basic spelling errors in Mr Trump’s posts (and more in other statements by his staff), some of them small (“counsel” as “council,” “gas” instead of “has,” “tapp” for “tap”), some large (“unpresidented” for “unprecedented,” “honered” for “honored”).

Perhaps most famously, Mr Trump incited a worldwide mystery with a middle-of-the-night tweet that introduced a new word to the language: “covfefe.” We still do not know what that means.

And so, as we debate this new mystery, we can tell you this: Mr Trump’s profanity-adjacent tweet went up on Sunday afternoon and had not been deleted by Sunday night.