For 6 months WHO lied about how they learned about the Wuhan outbreak, falsely claiming China notified them.
For 3 weeks in January WHO lied, parroting China's lie that there was no evidence of human-human transmission. Many WHO people believed China was lying but WHO parroted China's lie without any caveat.
For at least 6 weeks in January, February, and into March WHO lied, claiming this coronavirus transmits poorly.
For most of January and at least all of February WHO stated that travel restrictions such as travel bans were inadvisable and harmful. I am not aware of WHO having admitted being wrong.
For months WHO has gushingly praised China's handling of this coronavirus when in reality China withheld information and lied to the world, costing the world 6-9 weeks of possible preparation.
Until the heads of WHO's leaders are rolling down the streets of Geneva, the US should give as few $$ and as few days' membership as the 1948 Congressional resolution allows and get out.