Of course the justices have a right to do so. They do not lose their freedom of speech as a result of their robes. To the extent that taking such an active role diminishes the sense of impartiality that gives the justices such influence, I believe she is doing herself a dis-service. It even creates the potential (albeit unlikely) for impeachment if she fails to recuse herself on decisions upon which she has taken a position in advance of hearing argument -- this can be construed as an ethics violation. But the justices have a right to speak. Whether it is wise to do so......

Also, the President is only bound, constitutionally, to abide the advice and consent of the Senate. He can ignore the rest of the voices and chatter.

Seamus