President Donald Trump is going down. Everything he has done as President, which isn't a lot, and anything he does before he is ousted, which probably won't be a whole lot more, is going to be tainted by the knowledge that he was deeply corrupt and a criminal. He has failed to do anything right on the job so far, and it's not likely he will suddenly learn now. What use is it to keep denying his crimes? What can he possibly hope to gain from clinging to an empty title and sullying it even more with his disgraceful behavior? His legacy will be "the president who wasn't", not some bill he signed that was repealed soon thereafter.
Resign, Donald Trump.