Judges in two judicial circuits - the U.S. Court of Appeals for the 4th Circuit in Richmond and the U.S. Court of Appeals for the 9th Circuit in San Francisco - had cast doubt on Trump's third executive order banning nearly all travel from certain countries.
The Court ruled by 7-2 to allow the controversial policy to enter full force, affecting people from Chad, Iran, Libya, Somalia, Syria and Yemen, pending a number of legal challenges making their way through the courts.
"This decision ignores the very real human consequences to American citizens and their families overseas imposed by President Trump 's Muslim Ban 3.0", said CAIR National Litigation Director Lena Masri.
Just a week after Trump took office back in January he has given the initial traveling prohibition however it ended up being suspended across the country by the Seattle federal government judge.
Lawyers for the American Civil Liberties Union and the state of Hawaii filed lengthy responses urging the court to maintain the status quo while the legal claims are heard and decided.
Plaintiffs argued that the measure targets Muslims in violation of the US Constitution and did not advance security goals as the government claimed.
President Trump met with the Libyan prime minister on December 1 to discuss counter-terrorism efforts. Last week he shared on Twitter anti-Muslim videos posted by a far-right British party leader. "We continue to stand for freedom, equality, and for those who are unfairly being separated from their loved ones", he said. Federal judges in Maryland and Hawaii had partially blocked the restrictions, allowing people from these countries who can establish a bona fide relationship with a person or entity in the U.S.to travel.
The ban also covers people from North Korea and some Venezuelan government officials, but those provisions were already in effect.
The third version of Trump's travel ban, unveiled in September, drew immediate challenges in federal appeals courts in Richmond, Virginia and San Francisco, California.
Both courts are dealing with the issue on an accelerated basis, and the Supreme Court noted it expects those courts to reach decisions "with appropriate dispatch".
If anything, it said, the government's case has weakened.
"We agree a speedy resolution is needed for the sake of our universities, our businesses and most of all, for people marginalized by this unlawful order", Hawaii Attorney General Douglas Chin said afterward.
Justices Ruth Bader Ginsburg and Sonia Sotomayor would have left the lower court orders in place. "We look forward to presenting a fuller defense of the proclamation as the pending cases work their way through the courts", it added. Certain people from each targeted country can still apply for a visa for tourism, business or education purposes, and any applicant can ask for an individual waiver.
Trump's Travel Ban has been finally approved by the Supreme Court.
The Trump administration argued that a lot has changed since June. But the Trump administration, which says the ban is crucial to protect United States national security and deter terror attacks, secured strong support from the Supreme Court in a 7-2 vote to let the government move ahead while the appeals continue.
The administration has said the ban is not discriminatory and pointed out that many Muslim-majority countries are unaffected by it.