People from six mainly Muslim countries and all refugees now face tougher US entry due to President Donald Trump’s travel ban.
The ban took effect on Thursday, with activists condemning government’s policy and the court ruling.
In his reaction, Trump said the unanimous Supreme Court decision “is a clear victory for our national security.”
An official with the Department of Homeland Security said it expected, “business as usual at ports of entry,” adding: “Our people are well prepared for this.”
Immigration rights activists and lawyers said they would be on hand at major US airports ready to help arrivals and ensure those with valid visas were allowed in.
According to the new rules, for the next 90 days, those from the six countries without a close relationship will not be able to enter the US.
The US has released a list of those to be considered to enter and those barred.
OUT – grandparents, aunts, uncles, nieces, nephews, in-laws, extended family and grandchildren.
Also exempt from the new rules are those with business or educational ties to the US.
However, the guidelines specifically state that the relationship must be formal, documented and not formed for the purpose of evading the order.
Those who already hold valid visas are not affected.
Dual nationals who travel on their passport from the unaffected country will also be allowed entry.