Justice Anthony Kennedy, a conservative who provided key votes for same sex-marriage, abortion access and affirmative action, will retire from the Supreme Court.

The retirement is effective July 31, Kennedy said in a letter to President Donald Trump on Wednesday.

Kennedy's decision to step down could transform the Supreme Court for generations. Trump will have his second opportunity to nominate a justice and will likely replace Kennedy with a young, conservative jurist. That would create a bloc of five staunch conservative justices who could move the court further to the right and cement a conservative majority for the foreseeable future.