Donald Trump has challenged the world to work out what perhaps his most bizarre tweet ever means.

"Who can figure out the true meaning of 'covfefe'???" he posted. "Enjoy!"

The tweet was a reference to a bizarre post in which he wrote: "Despite the constant negative press covfefe". Almost immediately after deleting the tweet, he sent out the new challenge the world.

By deleting the original tweet – a process that came five hours and 130,000 retweets after it was posted – Mr Trump may have been breaking the law as well as causing further embarrassment.

Mr Trump's new challenge was greeted by a range of responses online. Some suggested that it was code, while others said it was complete nonsense and didn't mean anything at all.