Isn't he democratically elected winning both the electoral college and the popular vote? Democracy is not a guarantee that you will get the best or most qualified leader, just the most popular.
I do think an independent audit by the UN is warranted. Perhaps the next elections should have the UN monitoring it though the US would sooner leave the UN than allow that.
He came out in public and said he rigged the election with help from some powerful friends. He literally admitted to it, a week after being sworn in but just like always, no one ever does anything about it.