It's better to remain silent and appear a fool, than to speak and remove all doubt
One reason for not pursuing criminal charges against 'Pa FJB, despite evidence to support a prosecution, offered by the special counsel investigating his shenanigans after he left office in 2017, was that a jury would sympathise with him as a well-meaning, elderly man with a poor memory
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Clearly showing his lack of grip on the situation, 'Pa countered that there was nothing wrong with his memory. Silly old sod has no idea when he's on to a good thing; fool should've kept his mouth shut.
Having said that, opening his mouth seems to have reinforced special counsel's point. Perhaps it was all part of a masterful strategy. (thinking)
The president isn't getting any younger.
Anthony Zurcher, North America correspondent, BBC News
And he isn't getting any more lucid.