"We know that these truths are eternal because we are witnesses to the decency and greatness of our country", they concluded.
The combined message came a day after President Trump said there was "blame on both sides" in Charlottesville, where a young woman was killed when a white supremacist allegedly deliberately drove his auto into a group of counter-protesters.
Mr. Trump on Saturday said "many sides" deserved blame for the violence, then specifically criticized neo-Nazis and white nationalists Monday, before again blaming both sides in a press conference Tuesday.
House Speaker Paul Ryan also didn't use Trump's name directly but called the President out in opposition to what he said in the news conference.
He added that "you also had people that were very fine people on both sides".
"This is bad. The President of the United States needs to condemn these kinds of hate groups", said Kasich, who ran against Trump in the Republican presidential primary. Your words are dividing Americans, not healing them, ' he said.
"When neo-Nazis march in Charlottesville and scream slogans against Jews and in support of white supremacy, the condemnation has to be unambiguous".
The statement went on to condemn racism, stating that "we are created equal".
Lindsey Graham did criticize Trump directly over his comments. While in the past he'd been happy to issue moral judgments about other politicians, fellow heads of state, journalists and clothing retailers, here, facing questions about racism, he appeared to reject the role of moral arbiter.
According to CNN, the former presidents say people should always reject the kinds of bigotry and hatred that was seen in Charlottesville.
'Mr. President, I encourage you to try to bring us together as a nation after this horrific event in Charlottesville.
Celebrities and public figures took to Twitter to urge other Republicans and former presidents to form a united front in opposition to Trump's apparent unwillingness to challenge the resurgent far-right, which is highly supportive of his presidency.
He included a quote from former South African president Nelson Mandela: "No one is born hating another person because of the color of his skin, or his background, or his religion".