Some visa and green-card holders were blocked from boarding flights to the US after the order was issued and several people were being detained at US airports when they arrived, the New York Times reported. The Department of Homeland Security issued a directive on Friday afternoon ordering the Customs and Border Control agency to enforce the order immediately.
"We're concerned about the impact of this order and any proposals that could impose restrictions on Googlers and their families, or that create barriers to bringing great talent to the US," a Google spokeswoman said in a statement. "We'll continue to make our views on these issues known to leaders in Washington and elsewhere."
Some Google employees were traveling abroad and were trying to get back to the US before the order took effect. The company asked them to reach out to Google's security, travel, and immigration teams for assistance, according to a person familiar with the situation. The person asked not to be identified talking about internal company communications.
Google declined to say Saturday whether any employees were detained or blocked from boarding flights.
The employees in question normally work in the US but just happened to be abroad either on work assignments or vacations. One employee rushed back from a trip to New Zealand to make it into the US before the order was signed, Google's Pichai wrote in his memo.
"We are advising our clients from those seven countries who have green cards or any type of H-1B visa not to travel outside the US" said Ava Benach, a partner at immigration law firm Benach Collopy, while noting that the order takes effect immediately.
"No one is really sure whether a green card holder from these seven countries can return to the US now. It's fairly clear that an H-1B visa holder can't," Benach said. The H-1B lets US companies employ graduate-level workers from other countries in technical occupations such as technology, engineering and science.
"If anyone in these situations has the misfortune to have gone abroad recently, it's a treacherous moment, possibly for green card holders too," Benach said.
Other technology companies are likely in a similar situation, she added.
Facebook Chief Executive Officer Mark Zuckerberg said Friday he was "concerned" by Trump's recent moves to restrict immigration.
Microsoft Corp. inserted language in a securities filing on Thursday on the issue, cautioning investors that immigration restrictions "may inhibit our ability to adequately staff our research and development efforts."