Trump had 4 years to do something substantive to prevent election fraud. He did nothing.
Election fraud has to be addressed by the individual state legislatures. President Trump has been a mere civilian for the last two years.
You ascribe powers/responsibilities that he simply does not have.
At some point, we got to start wondering why Trump has done nothing about election fraud.
all elections are controlled by the states ... except the electoral vote for POTUS ... but I’m sure you knew that ...