This isn't 1846. Mexico is our largest single trading partner. Spending our own lives and treasure to babysit an unstable nation on our Southern border is in fact the last thing the US (whoever you're asking) wants.
That's the pressing question, watching the truth social meltdown following the supreme court tariff decisions really has allies wondering if the US system has functional guardrails and if the will to bell the cat exists sufficiently to exercise them.