Chief Justice John Roberts has declined an invitation from Senate Judiciary Committee Chairman Dick Durbin to testify before the committee on May 2, citing judicial independence and separation of powers concerns. The revelations about Justice Thomas' close ties to a billionaire Republican donor have “contributed to a crisis of public confidence” in the nation’s highest bench. Roberts' decision to decline the invitation is likely to add to the controversy surrounding the court and will be met with further action to address the ethical issues raised by the reports on Justice Thomas.