The WHO investigation in China into the origins of the coronavirus pandemic must be "
deep and clear,
" White House spokeswoman Jen Psaki said on Wednesday.
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"
It is imperative that we get to the bottom of things in the appearance of the pandemic in China,
" she said on the eve of the start of the field investigation by WHO experts, ensuring that United States "
supports an international investigation which in our opinion must be thorough and clear
".