He's not a bad card player despite the severe cognitive decline...  

When Joe wiped the floor clean of Trump in the last debates, Trump was somewhat shocked that he had been beaten down so hard. 

Trump says what he has to say to protect his ego. He uses whatever strategy he thinks will stick with no regard for the truth.

I happened to be at the same hotel as Biden a few months back and was invited to hear him talk for more than 30 minutes. He was impeccable and mis-pronounced one word -

So, when someone wants to find sound-bites from someone who had an issue with stuttering, understand they are obliged to find a perceived weakness ...

Trump is about Trump - He doesn't care about the nation ... only cares about himself.