Stephen Bannon, who as chief White House strategist was an architect of the travel ban, said that the court's ruling vindicated Trump and his Administration after receiving a year and a half of attacks from the political left over the policy.
The U.S. Supreme Court on Tuesday approved President Donald Trump's travel ban that targets several Muslim-majority countries.
The vacancy on the bench that the Ronald Reagan-appointed justice leaves behind will give Trump his second opportunity to nominate a Supreme Court justice. If Democrats stand united in opposition to Trump's choice, Senate Majority Leader Mitch McConnell of Kentucky can lose no more than one vote.
They also look at the political ramifications of Kennedy's retirement and how lawmakers are responding to the news.
Now, the president gets to nominate Mr Kennedy's replacement. Such a dramatic ruling may not be immediately likely, but a more conservative court might be more willing to sustain abortion restrictions.
Arizona Senator Jeff Flake questioned the wisdom of the policy, though he agreed with the Supreme Court that the policy is constitutional.
In the early days of Donald Trump's presidency, many progressive Americans dared to believe that maybe, just maybe, his election victory would not prove as consequential as they first feared.
Neil Gorsuch was eventually confirmed in April after using the so-called nuclear option that lowered the number of votes needed from 60 to 50. "If we put another two, three justices on, that will happen. that will happen automatically, in my opinion, because I am putting pro-life justices on the court".
"With so much at stake for the people of our country, the U.S. Senate must be consistent and consider the president's nominee once the new Congress is seated in January", Durbin said.
McConnell's inability a year ago to fulfill a longtime Republican promise of undoing Obama's signature health-care law strained his relationship with Trump and turned him into a momentary villain in his own party.
Mr Trump, who has called the travel ban necessary to protect the country against attacks by Islamic militants, reacted on Twitter on Wednesday morning (AEST), writing: "Wow!"
"Not since key decisions on slavery, segregation in schools, and Japanese American incarceration have we seen a decision that so clearly fails to protect those most vulnerable to government-led discrimination", added Farhana Khera, executive director of the group Muslim Advocates.
As you can imagine, more people are reading The Jerusalem Post than ever before.
Although he leaned conservative in his rulings, Kennedy was thought to be the Court's swing vote.