Tired of unequal trade. Tired of illegal immigration. Tired of defending our weak Allies. Tired of high taxes. Tired of Shiite public education. I could go on.
What it is, is being tired of our allies diverting what they would have spent on defense into their socialistic pipedreams, and then lording it over us for not following suit, as if they are so "enlightened" without caring that we paid for them to live defense-free while we spent that "peace dividend" on a global military presence on their behalf.
Trump is telling our allies that it's time for them to beware the enemies at their gate, because we're focusing on the ones at our gate now.
-PJ