He’s mentally unfit.
I agree. At first, it was sort of funny; but, after this amount of time, he seems to be getting worse. He was always quite dumb, really; but, this is a medical problem; and, his family should be encouraging him to stop. But, that would also stop their gravy train, so, they don't seem to care that he is struggling out there to even remember who he is, where he is, and what position he is running for (not the Senate).
A professor of BS.