The decision means people from five countries with predominantly Muslim populations are not allowed to enter the U.S.
By a vote of 5 to 4 on tuesday the supreme court upheld president trump's travel ban, in place since December.
It applies to people from five countries with overwhelmingly muslim populations: Iran, Libya, Somalia, Syria and Yemen. it also affects North Korea and some Venezuelan residents.
Judges on the East and West coasts have argued the policy was a form of religious discrimination.
But the nation's highest court said the travel order is "squarely within the scope of presidential authority."
Tuesday demonstrators gathered across country to protest the decision.
And politicians on both sides of the aisle spoke out.
"This was the right decision federal immigration law explicitly gives the president the authority to make determination in the national interests to keep us safe," Senator Ted Cruz (R-TX) said.
"This is really a sad day for America. Make no mistake: the Supreme Court has endorsed bigotry and Islamophobia. That's what they did," Representative Barbara Lee (D-CA) said.
President Trump has said the ban is to keep islamic extremists out. After the ruling he tweeted out "Wow".
Supreme Court Justice Sonia Sotomayor, in her dissent, criticized the court's decision saying it was "motivated by hostility and animus toward the Muslim faith."
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Immigrants, politicians and activists continue to react to the U.S. Supreme Court's ruling to uphold President Trump's travel ban.