Apple, Google and Facebook are among 97 companies who have signed a legal brief in official opposition to US President Donald Trump’s controversial travel ban.

The filing - known as an amicus brief, or ‘friend of the court’ - said President Trump’s executive order “violates the immigration laws and the Constitution”.

The ban, which prevents people from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen from travelling to America, was last week condemned by many of the world’s leading businesses, including top technology companies.

Nearly 100 of those companies have now made their opposition official after filing the legal brief to the US Court of Appeals late on Sunday night.