“Like many of you, I’m concerned about the impact of the recent executive orders signed by President Trump,” Zuckerberg wrote in a post.

“We need to keep this country safe, but we should do that by focusing on people who actually pose a threat. Expanding the focus of law enforcement beyond people who are real threats would make all Americans less safe by diverting resources, while millions of undocumented folks who don’t pose a threat will live in fear of deportation.”

Zuckerberg posted his message shortly after Trump signed an executive order to establish “new vetting measures” for refugees meant to prevent terrorists from entering the U.S.