How, though?
He’s compromised. He can be forced to resign.
He’s also culpable in FISAGATE as the FISC is his responsibility and it was subverted under his watch.
Much like presidents, US Supreme Court Justices can be impeached by Congress. Last Justice to have impeachment papers was Justice Chase in 1805 but was acquitted in the Senate.
Impeaching Roberts is a long shot.
Easier to force him to resign to escape scandal.
If the known horrors continue approaching limited public disclosure with Roberts shown to succumb to blackmail, no question he will resign in a deal to keep it discreet