Dr. Ben Carson said Thursday that it wasn’t “helpful” for former Republican presidential nominee Mitt Romney to devote an entire speech to criticizing GOP frontrunner Donald Trump.

“I don’t think it is the proper place for somebody which is the former standard bearer to be criticizing the leading contender at this time in such a negative way,” Carson said in a live interview with Yahoo! News. “I don’t see how that’s helpful.”

Romney skewered Trump in a press conference Thursday, calling the real estate mogul a smart person but “very very not smart” on foreign policy.

When Yahoo! host Katie Couric asked Carson whether he agreed with Romney’s criticisms, he dodged the question.

“Whether there’s legitimacy to it is beside the point,” Carson said.

Carson again reiterated that there was no “path forward” for his campaign and that he won’t appear at the Fox News debate on Thursday. He has avoided saying outright whether he is suspending his bid for the White House.