What to know about the Supreme Court and ethical concerns

New reporting from ProPublica has revealed another example of undisclosed expenses that Supreme Court Justice Clarence Thomas received from a wealthy Republican donor.

That investigation — which involves tuition payments that GOP donor, Harlan Crow, made to cover Thomas' grandnephew's private boarding school costs — is one of a number of recent examples that spotlight some justices' lack of disclosure of high-cost gifts, expenses and deals. This growing list is causing some to question court ethics and credibility. This latest ProPublica report came just two days after a Senate Judiciary Committee hearing — spurred by ProPublica's prior reporting — focused on the court's ethics and the need for a Supreme Court code of conduct.

Though the court declined to testify at that hearing, it has defended itself, arguing its members voluntarily follow the code of conduct used to supervise lower courts.

Here's a roundup of the