I’m wondering if that is the “official” story, but the real story is that Trump knows the Bushes are part of the Deep State.
It would seem there would be plenty of security already with 2 former Presidents and Melania there. So... hmmmmmm.
Hmmm. Very odd, but probably a VERY nice move by Trump, relationally, for the Bushes, as well as the address of the increased security complications. Look, I mean they despise him.
The Bushes will greatly appreciate the First Lady and will be pleased to have her. Trump otoh, displays the personal consideration to back away, for a couple of very good reasons.