Trump says he will choose from a list.
Conservative Justice Anthony Kennedy, 81, said on Wednesday that he will retire from the Supreme Court at the end of July.
Justice Kennedy provided votes for same-sex marriage, abortion access, and affirmative action during his 30 years in the seat reports Fox 5.
"The Constitution promises liberty to all within its reach," Kennedy wrote in his opinion of Obergefell v. Hodges, "a liberty that includes certain specific rights that allow persons, within a lawful realm, to define and express their identity."
His retirement will give president Trump a second opportunity to nominate a Justice, the first being Neil Gorsuch a year ago.
The president told reporters on Wednesday that the nomination process will "begin immediately" and will review a list of candidates and "It will be somebody from that list."
Some speculate that Trump will likely replace Kennedy with a young conservative who will move SCOTUS further to the right.