A restricted version of visa bans that US President Donald Trump wanted to introduce soon after the start of his Presidency have now come into effect.

The revised rules affect visa applications from citizens of six, mainly Muslim, countries who will only be able to get a visa if they have a close relationship with an entity of person in the US.

These relationships include a parent, spouse, child, adult son or daughter, son-in-law, daughter-in-law or sibling, under an agreement reached after months of legal argument.

Grandparents, grandchildren, aunts, uncles, nieces, nephews, cousins, brothers-in-law and sisters-in-law, fiancées or other extended family members are not considered to be close relationships.

The countries affected by the new visa rules are Syria, Sudan, Somalia, Libya, Iran and Yemen who face a ban for 90 days. The rules are also tough on potential refugees who face a ban of 120 days if they cannot prove a relationship.

Journalism students, workers or lecturers who have valid invitations or employment contracts in the US are exempt from the new executive order. ‘The exemption does not apply to those who seek a relationship with an American business or educational institution purely for the purpose of avoiding the rules,’ a State Department spokesman said.

The rules state that a legitimate business link must be formal and documented. Hotel or car rental reservations, for example, will not be regarded as a legitimate relationship.

The rules apply to visa applications from Friday 30 June. However, visas that have already been granted for future travel will not be revoked.

While the US Supreme Court has partially restored Trump's original executive order there will be further legal argument and a final ruling is expected towards the end of the year. Further legal arguments will not be heard until at least October.