“It’s painful to see the personal cost of this executive order on our colleagues,” Pichai wrote in the memo, a copy of which was obtained by Bloomberg News. “We’ve always made our view on immigration issues known publicly and will continue to do so.”

The comments underscore a growing rift between the Trump administration and several large U.S. technology companies, which include many immigrants in their ranks and have lobbied for fewer immigration restrictions. Pichai’s note echoed similar statements from tech peers voicing concerns about the harm such policies could have on their businesses.

Trump signed an executive order Friday prohibiting entry by people from seven majority-Muslim nations for 90 days. Citizens of Syria, Iraq, Iran, Sudan, Somalia, Yemen and Libya would be banned from entering the U.S. for the period, while the government determines what information it needs to safely admit visitors.

The Department of Homeland Security issued a directive on Friday afternoon ordering the Customs and Border Control agency to enforce the order, the New York Daily News reported. Late Friday, some green card and visa holders were already being blocked from boarding flights to the U.S., the newspaper said.