Trump vows to restore travel ban

US President Donald Trump has vowed to overturn a legal ruling which suspended his ban on travellers from seven mainly Muslim countries, BBC reports.

He described federal judge James Robart as a "so-called" justice whose "ridiculous" opinion "essentially takes law-enforcement away from" the US.

Judge Robart ruled on Friday there were grounds to challenge the ban.

A number of airlines have said they are allowing nationals targeted by the ban to board flights to America.

"The opinion of this so-called judge, which essentially takes law-enforcement away from our country, is ridiculous and will be overturned!" Mr Trump said on Twitter.

"When a country is no longer able to say who can, and who cannot , come in & out, especially for reasons of safety & security - big trouble!" he tweeted separately.

The US administration argues that his executive order last week, which caused confusion and anger, is designed to protect the US.