Microsoft and Apple have pledged to fight back against President Donald Trump's decision to rescind Deferred Action for Childhood Arrivals (DACA), which places more than 800,000 undocumented people who were brought to the United States as children at risk of deportation.

"If Congress fails to act, our company will exercise its legal rights properly to help protect our employees," Microsoft president and chief legal officer Brad Smith wrote in a blog post yesterday, shortly after US Attorney General Jeff Sessions said the Trump administration would dismantle the program.

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