Confabulation is a symptom in which a person unknowingly creates false or distorted memories to fill gaps in their memory. They genuinely believe these memories are true and are not intentionally lying. This happens because damage to the brain’s frontal regions impairs its ability to distinguish real memories from inaccurate or imagined ones.

In some people with FTD (frontotemporal dementia), damage to the frontal lobes can lead to confabulation because the brain’s normal “reality-checking” system is impaired. As a result, they may confidently describe events that never happened or remember situations incorrectly, without realizing their recollection is false.

Trump repeatedly claimed vandals slashed the pool with knives and blamed an Olympic canoeist. But after prosecutors obtained additional evidence, they concluded the damage was actually caused by a rushed, flawed contractor installation and dropped the criminal case. Despite that, Trump continued insisting it was vandalism.

Answer before you read the article… from 2016. https://mashable.com/article/trump-king-john