Republican presidential candidate Ben Carson on Sunday expressed skepticism over the purpose of the Black Lives Matter movement and refused to acknowledge that he made a mistake when calling the movement “silly.”

Last week, the neurosurgeon-turned-GOP presidential candidate said that Black Lives Matter is “silly” and “divisive.”

“We need to talk about what the real issues are and not get caught up in silliness like this matters or that matters,” he said. “Of course all lives matter. I don’t want to get into it. It’s so silly.”

On Sunday, Carson denied that he called the movement itself “silly” and clarified that he thinks the distinction between “black lives matter” and “all lives matter” is “political correctness going amuck.”

“Well, you know, I don’t recall calling it silly, but what I called silly is political correctness going amuck. That’s what’s silly. When, you know, I guess it was Martin O’Malley who said, you know, ‘Black lives matter, white lives matter.’ He got in trouble for that and had to apologize. That’s what I’m talking about is silly,” Carson said on NBC’s “Meet the Press.”