NEW - Biden says "The president wrote a very generous letter," referring to Trump. "Because it was private, I won't talk about it until I talk to him. But it was generous."
This taken from the US Military Voice Telegram Channel.
I'm betting the 'generosity' was the deal Biden cut with Trump...
In Ex parte Garland, 71 U.S. 333 (1866), the U.S. Supreme Court ruled that
The power of pardon conferred by the Constitution upon the President is unlimited except in cases of impeachment. It extends to every offence known to the law, and may be exercised at any time after its commission, either before legal proceedings are taken or during their pendency, or after conviction and judgment. The power is not subject to legislative control.
A pardon reaches the punishment prescribed for an offence and the guilt of the offender. If granted before conviction, it prevents any of the penalties and disabilities consequent upon conviction from attaching; if granted after conviction, it removes the penalties and disabilities and restores him to all his civil rights. It gives him a new credit and capacity. There is only this limitation to its operation: it does not restore offices forfeited, or property of interests vested in others in consequence of the conviction and judgment.
This is still established law today. So you're, like, super wrong.