After spending more $500 million on ads for a campaign that was doomed to fail from the start, former New York City mayor and billionaire Mike Bloomberg is not getting any sympathy from President Trump. The President’s tweet in reaction to Bloomberg’s announcement that he was suspending his presidential bid was unsurprisingly brutal:

“Mini Mike Bloomberg just “quit” the race for President. I could have told him long ago that he didn’t have what it takes, and he would have saved himself a billion dollars, the real cost. Now he will pour money into Sleepy Joe’s campaign, hoping to save face. It won’t work!”

Bloomberg took to Twitter too in order to respond.

He attached a video clip from Star Wars and captioned it: “See you soon, Donald”

Trump was not done with him yet. The President sent out a Tweet again, but this time he singled out Tim O’Brien, Bloomberg’s campaign adviser. O’Brien worked for Bloomberg’s company before he switched over to help with the billionaires’ campaign. Trump said through his Tweet, “Mini Mike Bloomberg will now FIRE Tim O’Brien, and all of the fools and truly dumb people who got him into this MESS. This has been the worst, and most embarrassing, experience of his life…and now on to Sleepy Joe!”

No one was surprised that Trump singled out Tim O’Brien. In 2005, O’Brien published a book about Trump. Titled TrumpNation, the book was a biography of sorts. In it, O’Brien claimed that Trump was not a billionaire or was close to being one. He claimed that Trump’s wealth was between $150-$250 million. Trump sued O’Brien saying that he included false information in the book to sell more copies but the libel suit was rejected in 2009.

There’s no love lost between Bloomberg and the President. Bloomberg has vowed that he would spend as much as $1 billion just to make sure that Trump is not reelected. Unlike his stature, Bloomberg’s wealth is not little. He has an estimated net worth of around $60 billion.

Bloomberg’s campaign with its late entry relied entirely on the power of his money. His strategists, including O’Brien, were betting on a strong showing for Super Tuesday, but they overestimated the power of Bloomberg’s dollars. They did manage to win in the U.S. territory of American Samoa while failing miserably everywhere else. The billionaire had vowed to support former Vice President Joe Biden, vowing that he would help towards getting him elected into the presidency.