Former Republican presidential candidate Mitt Romney says that Donald Trump is risking the “unraveling of our national fabric” by sending a message that — either intentionally, or not — “caused racists to rejoice, minorities to week, and the vast heart of America to mourn.”

Mr Romney, no stranger to criticising the President, called on Mr Trump to take “remedial action in the extreme” to ward off what he described as dire consequences both domestically, and in terms of national defence.

“This is a defining moment for President Trump. But much more than that, it is a moment that will define America in the hearts of our children,” Mr Romney wrote in a post on Facebook. “They are watching, our soldiers are watching, the world is watching. Mr. President, act now for the good of the country.”

The former governor of Massachusetts had written previously on the issue, and seemed to disagree with Mr Trump’s statement earlier this week when he said that both sides in the deadly conflict in Charlottesville had good people. — and appeared to equate both sides.

That demonstration was organised by white supremacists to protest the removal of a statue honouring an American Confederate general who fought to preserve the institution of slavery in the United States, and had attracted counter protesters. One of those counter protesters was killed, and 19 more were injured, after a car driven by a suspected white supremacist drove through a crowd.

“No, not the same,” Mr Romney wrote then. “One side is racist, bigoted, Nazi. The other opposes racism and bigotry. Morally different universes.”

Violence on the streets of Charlottesville Show all 9 1 /9 Violence on the streets of Charlottesville Violence on the streets of Charlottesville Protesters clash and several are injured White nationalist demonstrators clash with counter demonstrators at the entrance to Lee Park in Charlottesville, Virginia. A state of emergency is declared, August 12 2017 Violence on the streets of Charlottesville Trump supporters at the protest A white nationalist demonstrator walks into Lee Park in Charlottesville, Va., Saturday, Aug. 12, 2017. Hundreds of people chanted, threw punches, hurled water bottles and unleashed chemical sprays on each other Saturday after violence erupted at a white nationalist rally in Virginia. AP Photo Violence on the streets of Charlottesville State police stand ready in riot gear Virginia State Police cordon off an area around the site where a car ran into a group of protesters after a white nationalist rally in Charlottesville, Virginia AP Photo Violence on the streets of Charlottesville Militia armed with assault rifles White nationalists, neo-Nazis and members of the 'alt-right' with body armor and combat weapons evacuate comrades who were pepper sprayed after the 'Unite the Right' rally was declared a unlawful gathering by Virginia State Police. Militia members marched through the city earlier in the day, armed with assault rifles. Getty Images Violence on the streets of Charlottesville Statue of Confederate General Robert E Lee The statue of Confederate General Robert E. Lee stands behind a crowd of hundreds of white nationalists, neo-Nazis and members of the 'alt-right' during the 'Unite the Right' rally 12 August 2017 in Charlottesville, Virginia. They are protesting the removal of the statue from Emancipation Park in the city. Getty Images Violence on the streets of Charlottesville Racial tensions sparked the violence White nationalists, neo-Nazis and members of the 'alt-right' exchange insults with counter-protesters as they attempt to guard the entrance to Lee Park during the 'Unite the Right' rally Getty Violence on the streets of Charlottesville A car plows through protesters A vehicle drives into a group of protesters demonstrating against a white nationalist rally in Charlottesville, Virginia. The incident resulted in multiple injuries, some life-threatening, and one death. AP Photo Violence on the streets of Charlottesville Rescue personnel help injured people after a car ran into a large group of protesters after an white nationalist rally in Charlottesville, Virginia AP Photo Violence on the streets of Charlottesville President Donald Trump speaks about the ongoing situation in Charlottesville, Virginia from his golf club in Bedminster, New Jersey. He spoke about "loyalty" and "healing wounds" left by decades of racism.

Read his full statement below.

“I will dispense for now from discussion of the moral character of the president's Charlottesville statements. Whether he intended to or not, what he communicated caused racists to rejoice, minorities to weep, and the vast heart of America to mourn. His apologists strain to explain that he didn't mean what we heard. But what we heard is now the reality, and unless it is addressed by the president as such, with unprecedented candor and strength, there may commence an unraveling of our national fabric.

The leaders of our branches of military service have spoken immediately and forcefully, repudiating the implications of the president's words. Why? In part because the morale and commitment of our forces—made up and sustained by men and women of all races—could be in the balance. Our allies around the world are stunned and our enemies celebrate; America's ability to help secure a peaceful and prosperous world is diminished. 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?

In homes across the nation, children are asking their parents what this means. Jews, blacks, Hispanics, Muslims are as much a part of America as whites and Protestants. But today they wonder. Where might this lead? To bitterness and tears, or perhaps to anger and violence?

The potential consequences are severe in the extreme. Accordingly, the president must take remedial action in the extreme. He should address the American people, acknowledge that he was wrong, apologize. State forcefully and unequivocally that racists are 100% to blame for the murder and violence in Charlottesville. Testify that there is no conceivable comparison or moral equivalency between the Nazis—who brutally murdered millions of Jews and who hundreds of thousands of Americans gave their lives to defeat—and the counter-protestors who were outraged to see fools parading the Nazi flag, Nazi armband and Nazi salute. And once and for all, he must definitively repudiate the support of David Duke and his ilk and call for every American to banish racists and haters from any and every association.