Fingers crossed. They stole a number of races in 2018 (and reportedly a few states, all they had thought they needed, in 2016). I haven’t seen reason to be super-confident they won’t get away with more again in 2020.
Even though it shouldn’t be based on what POTUS has accomplished it’s going to be a nail biter for just the reason you mention. POTUS knows voter fraud is a big issue, I’m hoping he has set up deterrents and red flags.