Travel Ban

The 9th US Circuit Court of Appeals ruling came in a challenge to Mr Trump's order filed by the states of Washington and Minnesota. The US Supreme Court will likely determine the case's final outcome.

An executive order by Mr Trump temporarily banned entry for all refugees and visitors from seven mainly Muslim countries.

Federal judge James Robart, responding to a challenge by Washington state, suspended the order last Friday.

Trump, speaking to law enforcement officials in Washington, said he argued before the order was finalized for giving travelers a month's notice before cutting off entry to the US.

But he said he was overruled by law enforcement officials, who he didn't name, alleging the delay could prompt a flood of dangerous terrorists into the country -- an explanation that failed to account for the lengthy process of obtaining a US visa or applying for refugee status.

The brief was signed by nearly 100 companies including Facebook, Twitter, Intel, eBay, Netflix and Uber, as well as non-tech companies such as Levi Strauss and Chobani.

The document is an amicus brief, which allows parties not directly involved in a case but who feel they are affected by it, to give their view.