This is the new game then that is going to be played; Trump's failing economy, slow response on the coronavirus, his lies that got him impeached, his lack of action on the riots and anything else that the DEMS can manipulate public perception on, will all be blamed on his lack of cognitive ability. I think Trump already knew that this is what he's going to be dealing with and that is why at his last rally he made such mockery of the leftists pointing out his wobbling while descending the ramp and inability to hold up a glass. They haven't been able to take him down any other way, so now they are going to attack his mental and physical abilities to be president.
IF there is any chance that Trump has declined, this will weigh on him, especially since his last rally saw a huge decline in numbers. Regardless of reason, that is something that I think would bother Trump, he thrives on that feedback. That's what energizes him and keeps him going.
That's what this election is going to be about (if we make it there); who is more mentally stable and physically able to be president; Sloe Joe or President Donald J. Trump.