obstruction of justice?

again, the constitutional remedy is impeachment, fwiw.

arguably the framers didn't want the president's inner circle to become targets of political prosecutions.

also, i do think some previous pardons involved co-conspirators, libby scooter and cap weinberger, e.g.


the constitutional solution is impeachment.
i recognize that this process is broken.

Probably the extent of his involvement was to promise Nixon a full pardon if he resigned, but you can't say they were unconnected.