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Another 30 technology companies have joined Silicon Valley’s legal fight against President Trump’s immigration ban.

The addition of well-known names including HP, Adobe, Slack, Pandora and IAC takes the total number of tech companies included on the amicus brief to 127.

Also now lending their support to the legal challenge, which argues Mr Trump’s executive order on immigration is unconstitutional and harms their businesses, are Tesla and SpaceX. The electric-car and rocket companies are both led by Elon Musk, who is also an advisor on Mr Trump’s business council.

Still absent from the roll-call of tech industry titans are Oracle, Palantir and IBM. (Amazon is not part of the amicus brief, because it made its own filing as a witness in the Washington state attorney general’s original lawsuit.)

On Sunday night, Apple, Microsoft, Google, Facebook, Airbnb, Uber and Twitter were among almost 100 companies that submitted the amicus brief — a legal document filed by non-litigants with a strong interest in the subject — to the ninth US Circuit Court of Appeals.

“The order represents a significant departure from the principles of fairness and predictability that have governed the immigration system of the US for more than 50 years — and the order inflicts significant harm on American business, innovation and growth as a result,” the brief argued.

Copyright The Financial Times Limited 2019. All rights reserved.

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