Former New York Gov. George Pataki on Wednesday released a letter to the declared and soon-to-declare Republican candidates for president blasting mogul Donald Trump’s controversial comments on Mexicans and immigration.

“One hundred years ago, when Irish immigrants were coming to America, my grandmother among them, they were too often characterized as “drunks.” A few years later it was the Italian immigrants, my grandfather among them, who were called “mobsters” or worse, “dagos.” This type of divisive rhetoric is just wrong. It was wrong 100 years ago and it’s wrong today,” Pataki wrote in the letter, which included a “cc” to Trump himself.

“Yet here we are in 2015 and a leading candidate for the GOP nomination for president is calling Mexicans criminals, rapists and drug dealers,” the letter states. “This is unacceptable.”

Trump, who declared in June he would launch a presidential campaign, has been criticized for the controversial remarks, and both NBCUniversal and department store chain Macy’s has severed ties with him in the wake of the controversy.

The letter also helps Pataki, who has polled consistently low in the crowded Republican presidential field, gain some press as Trump’s comments continue to reverberate during a comparatively slow week in national politics.

Pataki, who has urged his fellow Republicans to de-emphasize social issues like same-sex marriage in the campaign, called on his fellow candidates to join him in denouncing Trump.

“Join me,” Pataki wrote. “Stand up now. Denounce his comments today.”