I don't recall anyone daring to charge Obama after he executed a teenage US citizen and justified it by saying he shouldn't have been with his US citizen father who was the real target - both without trial or due process, against their Constitutional rights.
That the Republican administrations face more criminal charges could be indicative of them doing more criminal things... or simply that they're not considered above the law. Except 45 of course, who has stated that he is indeed above the law.