NEW YORK (AP) — Google, Apple and other tech giants expressed dismay over an executive order on immigration from President Donald Trump that bars nationals of seven Muslim-majority countries from entering the U.S.

The U.S tech industry relies on foreign engineers and other technical experts for a sizeable percentage of its workforce. The order bars entry to the U.S. for anyone from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen for 90 days.

The move, ostensibly intended to prevent extremists from carrying out attacks in the U.S., could now also heighten tensions between the new Trump administration and one of the nation’s most economically and culturally important industries. That’s especially true if Trump goes on to revamp the industry’s temporary worker permits known as H-1B visas, as some fear.

BITING BACK

“I share your concerns” about Trump’s immigration order, Apple CEO Tim Cook wrote in a memo to employees obtained by The Associated Press. “It is not a policy we support.”

“We have reached out to the White House to explain the negative effect on our coworkers and our company,” he added.

Cook didn’t say how many Apple employees are directly affected by the order, but said the company’s HR, legal and security teams are in contact to support them. “Apple would not exist without immigration, let alone thrive and innovate the way we do,” Cook wrote – an apparent reference not only to the company’s foreign-born employees, but to Apple co-founder Steve Jobs, the son of a Syrian immigrant.

Netflix CEO Reed Hastings was forcefully blunt. “Trump’s actions are hurting Netflix employees around the world, and are so un-American it pains us all,” he wrote on Facebook . “Worse, these actions will make America less safe (through hatred and loss of allies) rather than more safe.”