MBtv: Why has Trump frozen funding to the WHO?

In a widely-condemned move, Donald Trump has halted funding to the World Health Organisation. Washington is the biggest single contributor to the United Nations’ health agency, committing some 400 million dollars last year. The US president has been criticised for responding too slowly to the pandemic and for minimising the seriousness of COVID-19, but he is shifting the blame and penalising the WHO. What is the story behind the decision?