Everything the crook signed is illegal. 8 years of fraud would be eradicated. All the laws, the EOs, he signed would all have to be resubmitted. Anyone convicted of his illegal laws would be freed. All the pardons he issued would be revoked and the criminals would be re-arrested and jailed. It's a start.
C'mon, tell me it wouldn't be a grin or two.
Biden, Kagan, Sotomayor and many others would be illegitimate appointments.