The other thing POTUS could be referring to is the murder of bi-polar Teresa Heinz husband.
John Heinz was a representative and later US Senator, and he was their heir to the Heinz ketchup fortune. His wife Teresa was/is bi-polar, depressive and heavily medicated.
plane meets helicopter
Heinz plane had landing gear trouble, a helicopter was sent to inspect the lg in flight, and pilot error (NTSB) was blamed for the crash which no one survived. The burning helicopter landed just behind a school.
https://en.wikipedia.org/wiki/Merion_air_disaster
John Kerry to the rescue
Heinz was killed in 1991. Heinz senate collegue, John Kerry not noted for depth of feeling called to consol the stupified bi polar widow. When the estate was settled Kerry married her in 1997.
was sen john heinz murdered?
Anon worked with a man who knew John Kerry well, and beleived Kerry was involved in the death of John Heinz. From looking at the accident doesn't seem likely -look like pilot error. Coincidence.
Then again, Q says most plane crashes are not accidents. Anon is a pilot, believes this also and that there are no such things as a coincidences.
https://www.nytimes.com/1991/04/05/us/senator-heinz-and-6-others-killed-in-midair-crash-near-philadelphia.html
https://en.wikipedia.org/wiki/John_Heinz