In that time, his score drifted toward the liberal bloc - think of his tiebreaking votes on important issues such as abortion and gay rights - while the other justices, with the notable exception of Roberts, remained more entrenched in their separate positions.
The 5-4 decision was a big victory for Trump in the court's first substantive ruling on one of his administration's policies.
President Donald Trump's broad powers over immigration to protect national security aren't canceled by his campaign statements calling for a Muslim ban, a sharply divided Supreme Court said Tuesday.
The statement issued by the court said that Kennedy's decision was motivated by his decision to spend more time with his family.
"President Trump has done it once, and he will do it again by appointing another great justice to the high court".
But Kennedy, a Ronald Reagan appointee, has been a moderate over the years and sided with liberals in cases about abortion and LGBT rights, Stone noted.
"He is a man who has displayed tremendous vision and tremendous heart and he will be missed", Trump said.
"The Senate should reject on a bipartisan basis any justice who would overturn Roe v. Wade", he said, adding that the justice should not come from Trump's previous list of 25 potential justices the president compiled with the help of the Federalist Society during the search for late Justice Antonin Scalia's replacement.
Russian Federation backs OPEC oil output hike
Iran has objected to having members with additional capacity such as Saudi Arabia fill Venezuelan output gaps. Trump has been calling publicly for the cartel to help lower prices by producing more.
The travel ban, which the Supreme Court allowed to take effect in December, has been widely criticised by refugee and human rights groups. Most notably, he wrote the 2015 ruling on Obergefell v Hodges, which found that a ban on same-sex marriage was unconstitutional.
"This is the moment conservative women have been waiting for - the chance to return justice and constitutional limits to the nation's highest court".
There are only nine justices, who only get replaced if they retire or die, so who sits on it really matters. His first justice, Neil Gorsuch, has not yet ruled on abortion's legality but is generally embraced by pro-life advocates.
Democrats were left irate in 2016, after a Republican-majority Senate refused to vote on Barack Obama's 2016 nominee Merrick Garland.
Prominent on the list of possible successors are Judges Thomas Hardiman of Pennsylvania and William Pryor of Alabama, who were seriously considered for the seat eventually filled by Gorsuch, and Judge Brett Kavanaugh, who serves on the federal appeals court in Washington.