Google chief executive officer Sundar Pichai isn’t going to take Donald Trump’s comments about Muslims lying down.

Pichai, an immigrant himself who came from India, slammed Trump in a letter posted on Medium titled, “Let’s not let fear defeat our values,” according to a TechCrunch report. While Pichai didn’t name Trump specifically, it was clear that the letter was directly at recent controversial comments made by Trump.

“I feel we must speak out — particularly those of us who are not under attack,” he wrote in his missive. “Everyone has the right to their views, but it’s also important that those who are less represented know that those are not the views of all.”

Pichai has been the head of the tech giant since August. He moved to the United States as an adult to attend school, and said that the open-mindedness of Americans is “one of the country’s greatest strengths and most defining characteristics.” He added the America was founded on the backs of immigrants, and that is what makes it great.

He called anti-immigrant comments — again, not mentioning Trump but clearly alluding to him — a disheartening phenomenon.

“I walk around the campus where I work and see a vibrant mix of races and cultures,” he wrote. “Every one of those people has a different voice … a different perspective … a different story to tell. All of that makes our company an exciting and special place to be, and allows us to do great things together.”

Trump has once again drawn oceans of criticism after he called for a ban on Muslims entering the country in the wake of terror attacks by people affiliated with the Islamic State (ISIS). Many industry leaders and politicians have denounced the comments, but Trump has refused to back down and enjoys wide support for those comments among his supporters and Republicans in general.