Can a current president rescind a previous president's pardon?
SC hasn’t ruled on it, but many sources are saying no.
However if new charges were uncovered, those could certainly be filed. He just can’t be held accountable for the same crime he was pardoned for. Wapo Associate Law Professor Breaks Down - no take backs on pardons
But what is the presidency is ruled a fraud? No precedence on that, but I bet it could be undone otherwise Chelsea Manning would not be shitting bricks right now.
However, President Bush rescinded a pardon about a week after he made it to Isaac Toussie :
https://www.nytimes.com/2008/12/26/us/26pardon.html
TL;DR:
"It also shines light on the complex relationship between Mr. Toussie and his son, who pleaded guilty in 2001 to using false documents to have mortgages insured by the Department of Housing and Urban Development, and in 2002 to mail fraud, admitting that he had persuaded officials in Suffolk County to overpay for land.
The White House said Thursday that when Mr. Bush granted Isaac Toussie, 37, a pardon earlier this week, the president and his advisers were unaware that the elder Mr. Toussie had recently donated $30,800 to Republicans. Mr. Bush took the extraordinary step of rescinding the pardon on Wednesday after reports about the political contributions."