"I'M BACK! #COVFEFE," Trump wrote on the platform, which he founded and is owned by Trump Media & Technology Group.

In the same post, he also shared a photo of himself appearing to use a phone while standing in front of his Mar-a-Lago Club in Palm Beach, Florida.

It comes after Trump said in February that people should "get ready" and your favorite president will see you soon!"

The hashtag "covfefe" refers to a mysterious term Trump first posted in May 2017 on Twitter that said, "Despite the negative press covfefe." It received over 122,000 shares and 155,000 likes before being deleted. Trump never corrected the spelling of "covfefe" nor explained what the term meant, and even wrote the next day, "Who can figure out the true meaning of "covfefe" ??? Enjoy!" The mysterious term remains open to interpretation.

Trump's first Truth Social post comes after Twitter announced on April 25 that its board accepted Elon Musk's offer to purchase the company and make it private in an offer valued at about $44 billion.

The former president told Fox News on Monday he would not come back to Twitter and would stay on his own Truth Social platform going forward. The company's CEO is former Rep. Devin Nunes (R-Calif.).