“Goodbye to America!” – senile Donald Trump vows 100% tariffs on country whose name he can’t get right

Donald Trump really doesn’t want anyone focused on how much of a disaster his press conference about the plane crash was today, and so now he’s trying a new approach. Trump just announced that he’s going to hit a group of countries with 100% tariffs. The trouble: not only is this unrealistic and insane, Trump doesn’t know which countries he’s threatening.
Trump is vowing to impose these 100% tariffs (by next week it’ll be a million percent tariffs) on the BRICS countries. But just last week, Trump falsely identified Spain as being one of the BRICS countries (the “S” stands for South Africa). So Trump is pretty much threatening to hit Spain with tariffs for something that South Africa did. Talk about senile.
It’s hard to say what’s more unhinged here: the kind of threats Trump is making, the fact that he doesn’t know what country he’s even threatening, or the language he’s using. Trump’s social media post ended with this: “any Country that tries should say hello to Tariffs, and goodbye to America!”
Why in the name of all that is holy is the President of the United States using the phrase “goodbye to America” in any capacity?