Bolton told Schifty that he would challenge the legitimacy of a subpoena from his Star Chamber in court, & old meth head liddle kid diddler knew courts would bitch slap him, so he-
If it goes to Senate & Grahm follows actual legal procedures like an American statesman should, Schifty & WB would have no basis to disregard subpoena.
They could, on national tv, plead the 5th, and likely be lynched leaving the bldg if they do.
But he has neither brains nor class nor morals, so I wouldn't put it passed him.
But he has to show up.