A New York Times journalist has admitted that she had a three-year affair with the former committee aide.
Thursday's ruling came in the case of Allen Eugene Gregory, who was convicted of raping and murdering a woman in 1996.
The officer is suspected of attempting to steal sensitive information from GE Aviation, an Ohio-based company that makes aircraft engines.
The court's newest member chatted occasionally with Justice Elena Kagan, who sits next to him on the bench.
The court could soon decide to take up some hot-button issues, and the newest justice will likely play a decisive role.
On the docket this fall are important cases on double jeopardy and the power of federal agencies, and DACA could be taken up as well.