India, June 5 -- US President Donald Trump on Thursday said that he is "very disappointed" in Elon Musk after the billionaire turned on the Republican tax bill.

Trump suggested the world's richest man misses being in the White House and has "Trump derangement syndrome", according to the Associated Press.

"I'm very disappointed in Elon," Donald Trump said. "I've helped Elon a lot."

Trump's criticism of Elon Musk, a powerful ally of his, comes days after the Tesla CEO had dubbed the American president's spending bill as "a disgusting abomination".

"I'm sorry, but I just can't stand it anymore. This massive, outrageous, pork-filled Congressional spending bill is a disgusting abomination. Shame on those who voted for it: you know you did ...