In support of Trump's position -
One of Trump's Executive Orders required withdrawal from the World Health Organization.
Which apparently resulted in this:
Pai says if there is a major disease outbreak and the U.S. isn't looped into the worldwide response, it would spread -- likely into Canada.
nationalpost.com
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Why can't this international organization operate just because the US withdraws its support?
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This is what Trump and the vast majority of Americans are concerned about. Every international body is reliant on US taxpayer money. And nobody else ponies up anything like their share. The institutions have been in place since 1944. Their budgets were set in 1944.
The world no longer looks like it did in 1944.
The Yanks can't foot everyone else's bill.