These are the tech giants who didn't sign Silicon Valley's letter against Trump's travel ban

On Sunday night, as the Super Bowl raged on in Houston and in house parties all over the world, people at the largest Silicon Valley companies were putting together the final touches on what would be a historic letter to a sitting American President.

97 tech companies signed on to a 54-page amicus brief—a document, submitted to a court, by non-litigants who have an interest in a case. The brief, filed to Washington State court, opposed President Trump's ban on immigrants arriving from one of seven Muslim-majority nations.