Justice Stephen Breyer to retire from Supreme Court on Thursday

• Breyer announced his retirement back in January, and Jackson was confirmed as his successor in April.

What he's saying: "It has been my great honor to participate as a judge in the effort to maintain our Constitution and the Rule of Law," Breyer said in his letter.

The big picture: The court will issue its last two opinions on Thursday morning.

• The rulings will focus on the Environmental Protection Agency's authority over greenhouse gases and on the Trump-era "Migrant Protection Protocols," most commonly known as the "Remain-in-Mexico" policy.

Editor's note: This story has been updated to reflect that Judge Ketanji Brown Jackson is set to be sworn in Thursday at noon.