Former Republican presidential nominee Mitt Romney just delivered a takedown of current Republican front-runner Donald Trump.

In a speech on Thursday, Romney made the case for why Trump is bad for America. (In his own Mitt Romney way.) Here are five of his best burns:

“A business genius he is not.”

“We’ve long referred to him as ‘The Donald’ … and it wasn’t because he had attributes we admired.”

“The country would sink into prolonged recession.”

“Donald Trump is a phony, a fraud. His promises are as worthless as a degree from Trump University.”