Not sure what Mexicans, central Americans or African American friends or needed votes have to do with a vaccine and the USA sharing it. If the USA discovers it first the non governmental private company that develops it will sell it to the world and make huge profits. There's no reason to not sell it worldwide.
He is sending a message to the WHO and has continually sent messages to China. You may disagree with the strength or type of message sent, but a message it is nonetheless.
What it has to do is with the fact that that he’s gonna need someone to make the scape goat to give his base a chubby. Blame it on Chinese, those wearing a mask are “politically correct”, lol. Even his African American friend who he pointed out in that ralley now says he thinks DJT is a tool.
It’s not a message to WHO or China, it’s a way to deflect the incompetence of his leadership
If he really meant biz he woulda gotten an international team into China to see what exactly went down, instead he was on his knees in front of Xi Jinping.