The Title of Nobility / Emoluments Clause [1] and the natural born (and age) qualifier are fairly specific as to what the framers thought were overly corrupting influences for the office of president.

They notably did not include "or family".

The expectation presumably being that foreign powers were clearly enough signalled to tread carefully with regards to exerting pressure on government officials.

At high levels, that seems reasonable. At lower levels, where there's less scrutiny and less opportunity for diplomatic redress? "Reasonable" measures seem murkier.

[1] https://www.law.cornell.edu/constitution-conan/article-1/sec...