“We share the concerns about the impact of the executive order on our employees from the listed countries, all of whom have been in the United States lawfully, and we’re actively working with them to provide legal advice and assistance,” Microsoft told CNBC.

Facebook also told CNBC that it was assessing how to protect its workers from adverse effects.

Meanwhile, Google CEO Sundar Pichai said in a memo to employees that nearly 200 employees abroad would be affected by the move. “We’re concerned about the impact of this order and any proposals that could impose restrictions on Googlers and their families,” a spokesperson said in a statement released to CNBC.

Facebook CEO Mark Zuckerberg was one of the first to address the ban publicly. “We need to keep this country safe, but we should do that by focusing on people who actually pose a threat,” Zuckerberg wrote on Facebook on Friday.

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

Airbnb co-founder and CEO Brian Chesky also advocated for “open door” policies said that

Uber told CNBC that it had 12 employees affected by the order, and is offering legal support. In an internal memo, Uber CEO Travis Kalanick also pointed out that the ban affects “thousands” of Uber drivers who “take long breaks to go back home to see their extended family.”

Sam Altman, president of prestigious start-up program Y Combinator, called on tech leaders to take action, writing in a blog post on Saturday that “it is time for tech companies to start speaking up about some of the actions taken by President Trump’s administration.”

Slack boss Stewart Butterfield tweeted that America is “throwing away” its moral authority with the ban. “Immigration is unambigously an economic benefit, but, doesn’t matter: [D]o the right thing because it’s right,” Butterfield tweeted.

Anil Dash, CEO of Fog Creek Software, which helped create products like StackOverflow and Trello, called for more action from the technology community.

MIT said that the ban was already affecting international students, and Carnegie Mellon engineering professor and frequent tech industry commentator Vivek Wadhwa said that it was courageous for Butterfield to make a statement.

“Why is not every other tech executive — and human being?” he tweeted.

As the day wore on, many other tech leaders chimed in:

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