Robert Mueller’s investigative team is growing again. This time he’s added a top-notch Russian-speaking attorney:

Elizabeth Prelogar, an assistant to the solicitor general, is working with deputy solicitor general Michael Dreeben in his part-time role in Mueller’s legal team, according to lawyers familiar with the assignment. The participation of Dreeben, the Justice Department’s top criminal law expert, was widely seen as a sign that Mueller was investigating possible criminal violations by President Donald Trump or others.

She has impressive credentials, especially when it comes to Russian relations:

Prelogar, a former law clerk to Justices Ruth Bader Ginsburg and Elena Kagan, is a Harvard Law School graduate and formerly worked in private practice at Hogan Lovells. Her involvement in the Russia probe has not previously been reported.

Prelogar also appears to be fluent in Russian. As an Emory College undergraduate, she majored in English and Russian. After graduating from Emory she was a Fulbright scholar in Russia. When she was a 1L at Harvard Law in 2006, she won an Overseas Press Club scholarship to study Russian media and censorship.

Mueller also recently added Andrew Weissmann, known for his ability to flip witnesses, as he did with the Enron prosecution.

Stay tuned.