According to the Financial Times, Donald Trump has threatened to quit the World Health Organization (WHO).

Donald Trump has threatened to withdraw from the World Health
Organization unless it demonstrates independence from China, in an
escalation of his attack on the body.

In a letter to Tedros Adhanom Ghebreyesus, director-general of the
WHO, Mr Trump said he would take one of several dramatic actions
unless the global health body committed to reform within 30 days.

“If the World Health Organization does not commit to major substantive
improvements within the next 30 days, I will make my temporary freeze
of United States funding to the WHO permanent and reconsider our
membership in the Organisation,” he wrote.

I don't see any benefit the USA could gain by doing so. What benefits would there be for the US if this threat was followed through on?