Trump's original executive order banned immigration from Iran, Iraq, Syria, Sudan, Libya, Yemen, and Somalia.
Spokespeople for , Google and Microsoft declined to comment.
Descriing refugees as "Dreamers" in the letter, they refer to the 750,000 immigrants who came to the U.S. under the protection of the Deferred Actions for Childhood Arrivals (DACA) program. Some of them have even set up funds to aid immigrants who are caught in the mire and have no place to turn to after the order. Some Google employees also held protest rallies outside their offices around the world, posting to social media with the hashtag, #GooglersUnite. Google CEO Sundar Pichai denounced the order, arguing that it had stranded almost 200 of his employees overseas, according to USA Today.
"It's still very early, but the strategy would probably be similar to the San Bernardino iPhone briefs", said one tech sector employee familiar with talks on the condition of anonymity. The statement is likely a reference to co-founder Steve Jobs who has a Syrian heritage.
Others such as Elon Musk of SpaceX, Jack Dorsey of and Mark Zuckerberg of Facebook have also expressed concern over the order.
"This is not a policy we support", said the bank's CEO, Lloyd Blankfein, in a voicemail to employees.
USA immigration system in chaos after travel ban
The Council on American-Islamic Relations said it would challenge the constitutionality of the executive order. She said lawyers were contacting federal immigration officials late Saturday to ensure the stay is enforced.
An upcoming executive order could force technology companies to change the way they source talent.
Critics also say the structure of the H-1B program needs to be reformed to give visa holders greater freedoms and more protection from potential abuses by their sponsoring employer.
CEO Brian Chesky "Not allowing countries or refugees into America is not right, and we must stand with those who are affected".
The Council on American-Islamic Relations and the American Civil Liberties Union have also challenged the order's legality, saying it exclusively targets Muslims. Among them are "Kentucky Route Zero" developer Cardboard Computer, "Nuclear Throne" developer Vlambeer, and "1979 Revolution" developer Ink Stories.
Last week, Microsoft addressed potential changes to visa programs in a filing with security regulators, saying, "changes to USA immigration policies that restrain the flow of technical and professional talent may inhibit our ability to adequately staff our research and development efforts". The funds came from both game and merchandise sales within a particular period.
The Trump administration is already under heavy criticism over its recent move to ban refugees from seven predominantly Muslim nations. This isn't quite a surprise: a year ago, Trump vowed that he would "end forever the use of the H1-B as a cheap labor program", which the tech industry relies on, "and institute an absolute requirement to hire American workers first for every visa and immigration program".
