I suspect that POTUS floated that to preempt what the D party was going to do later.
Q warned that they may try to replace Biden at the 11th hour.
How could they do that?
Assassinate him?
Blame it on PORUS or a Trump/Q 'conspiracy theorist'?
Demand Trump and Pence resign?
Put Pelosi in WH and then postpone the election until they can rig it?
But now they are all on record screaming that it can't be postponed.
Because nothing will stop what is coming.
Just a thought.