There is a huge industry making drugs in the US under license from foreign patent holders. Relatively few are manufactured abroad and shipped to the US. This tariff threat just shows ignorance of the industry they are trying to tax.
That only applies to Republican presidents. The moment a case against a Democratic president comes up, Roberts et alia will find a way to reverse themselves.
No need, I have been following this issue closely since 2001 when I was studying the I A and associated regs in law school. The immigration judges I practiced before would be shocked to hear about an open borders policy.
And there was not an open border policy under Clinton, Obama, or Biden, for that matter. This is a buzzword that GOP elites used to mislead their followers.