Former Republican presidential nominee Mitt Romney called on President Donald Trump to “acknowledge that he was wrong” and apologize for his remarks about the violent Charlottesville rally.

“Whether he intended to or not, what [Trump] communicated caused racists to rejoice, minorities to weep, and the vast heart of America to mourn,” Romney wrote.

Romney emphasized that Trump’s hesitation to explicitly condemn white supremacist groups could be a national security issue.

“Our allies around the world are stunned and our enemies celebrate; America’s ability to help secure a peaceful and prosperous world is diminished,” Romney wrote. “And who would want to come to the aid of a country they perceive as racist if ever the need were to arise, as it did after 9/11?”

He also argued Trump should be setting a better example for children across America.

Read Romney’s full Facebook post below: