>Serious question: Are there ANY crimes that are NOT pardonable?
Only those resulting in impeachment from office.
>Wondering if treason and sedition are unpardonable crimes…..
Negative:
ArtII.S2.C1.3.1 Overview of Pardon Power
Article II, Section 2, Clause 1:
The President shall be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States; he may require the Opinion, in writing, of the principal Officer in each of the executive Departments, upon any Subject relating to the Duties of their respective Offices, and he shall have Power to grant Reprieves and Pardons for Offences against the United States, except in Cases of Impeachment.
The Constitution establishes the President’s authority to grant clemency, encompassing not only pardons of individuals but several other forms of relief from criminal punishment as well. The power, which has historical roots in early English law, has been recognized by the Supreme Court as quite broad. In the 1886 case Ex parte Garland, the Court referred to the President’s authority to pardon as unlimited except in cases of impeachment, extending to every offence known to the law and able to be exercised either before legal proceedings are taken, or during their pendency, or after conviction and judgment.
https://constitution.congress.gov/browse/essay/artII-S2-C1-3-1/ALDE_00013316/