Apple, Alphabet's Google and Facebook are among more than 60 technology companies that appear to have backed away from the legal fight against U.S. President Donald Trump's controversial travel ban, deciding not to put their weight behind a lawsuit seeking to block the second version of his executive order.

A legal brief filed in federal court in Hawaii on Tuesday on behalf of Silicon Valley companies listed the support of 58 companies, less than half the 127 signatories to a similar brief filed in an appeals court last month after Trump's first executive order banning travel from a number of countries the administration said posed a security risk.