The most chilling point of this article (about Presidential assassinations) is that if POTUS shuts down the border he shuts down a black-market flow of drugs, human trafficking and kickbacks measuring the better part of $1 Trillion per year (my numbers, not the article’s).
The article argues this could not be tolerated by beneficiaries including factions of the U.S. intelligence community and a lot of RATS, Derps and non-Government Criminals.
The U.S. Presidency is a dangerous occupation. The odds of being asassinated are 7 in 45, if probable assassination deaths of Zachary Taylor, Warren G. Harding and William Henry Harrison are included.
This does not include numerous FAILED attempts, probably on every President, but notably including Ronald Reagan, Teddy Roosevelt, Andrew Jackson and FDR—all of whom were shot or shot at from close range but survived.
you will love this story about how Lincoln avoided assasination while traveling to his first inauguration
https://www.smithsonianmag.com/history/the-unsuccessful-plot-to-kill-abraham-lincoln-2013956/
Teddy Roosevelt - there was a man. Took a round in the chest, stood there and finished his speech.