"By a 7-2 vote, the Supreme Court has decided-at least temporarily, pending a final determination of the merits-that decisions affecting our national security should be made by Congress and the president, not by a single federal judge sitting in a courthouse in Hawaii", said John Malcolm, head of the Institute for Constitutional Government at The Heritage Foundation. The U.S. Department of State issued guidance in September that the ban would not affect people already in the country on a valid visa.
Trump's travel ban was challenged by Hawaii and American Civil Liberties Union in separate lawsuits.
The ruling signals that the justices will likely uphold the ban outright once challenges make their way back to the Supreme Court.
President Donald Trump won a big victory Monday in the Supreme Court, which upheld his "extreme vetting" on immigration into the United States. Grandparents, cousins and other relatives were among those courts said could not be excluded.
Lower courts had previously limited the scope of the ban to people without either certain family connections to the United States or formal relationships with U.S. -based entities such as universities and resettlement agencies.
Solicitor General Noel J. Francisco representing the Trump administration, said, the latest executive order, followed a "comprehensive, worldwide review of the information shared by foreign governments that is used to screen aliens seeking entry to the United States".
"President Trump's anti-Muslim prejudice is no secret - he has repeatedly confirmed it, including just last week on Twitter", ACLU lawyer Omar Jadwat said. And now even these people will be barred.
And the government says that the difference here is that there are non-Muslim countries who are on the list.
"This order is cut and dry: no analysis, no grappling with the law or facts-that's why we can't predict what the ultimate decision will be", Tumlin said.
Immigrant advocates said Monday's ruling is a blow to those who have fought Trump's travel ban since January.