I doubt he will do that . I'm just letting you know Joe even before becoming president tried to toss it out 4 times . And he won't have a problem doing it again just being honest. However I don't care for ether of them..

Dementia is DIAGNOSED by a physician who is a specialist in neurological disorders. Joe Biden has not been diagnosed with dementia.
Also, there is a CONSTITUTIONAL procedure under the 25th amendment that gives Congress the ability to remove a president who is no longer able to fulfill his duties. Has Congress used this power to remove Joe Biden from office? No.
I'm pretty sure Congresswoman Marjorie Taylor Green would be constantly talking about using the procedure if Joe Biden could no longer fulfill his duties. Of course the LACK OF A DIAGNOSIS prevents this.

Trump will try to change the law about how many terms a person can be the President. After President Franklin Roosevelt died in his third term in office a law was created a person could only serve two 4 year terms in office.