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I once worked for Amex, I do not think that there was anything political about this.

Most likely they saw the auction he had, and that his suppliers were demanding payment sooner and decided that he was a potential credit risk and reacted accordingly.

Amex is extremely anal about their money and collecting it.

I have an amex card with no limit, if I wanted to go out and buy a Tesla with it I could, however if I went 30 days late with another card they would freeze my spending limit so fast it would make my head spin.