Funny that the only couple of reports of "voter fraud" were Trump supporters trying to vote twice. One of the reasons this person gave was "she voted twice because she was afraid her vote for Donald Trump would be changed to a vote for Hillary Clinton." (The Guardian).
I did notice news last week that in the UK they are now so concerned about voter fraud that ID documents will be required for voting. Whether it transposes to the US I don't know but it seems perfectly possible.