Washington (CNN) Rod Rosenstein, the embattled deputy attorney general, took a break from supervising the Russia investigation on Monday to make his debut before the Supreme Court and argue a technical sentencing guidelines case.

A seasoned prosecutor, Rosenstein was completely at ease as he jumped into arguments and answered questions, at times relying upon his notes in a brown folder, during the 60-minute argument.

Rosenstein donned a morning coat that is traditionally worn by government lawyers arguing before the court as well as presidential cufflinks that were given to him last Friday by White House counsel Don McGahn.

Asked by a reporter about the cufflinks before arguments began, Rosenstein simply smiled, displayed the cufflinks and said, "Not bad," while laughing.

After arguments he posed with his family on the iconic marble steps and then walked to his car without answering any questions.

Read More