“If it was true, then WH would have informed the governors as soon as possible . . .”
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I do not think so, necessarily.
The MIL very much does not want to be involved in US politics. They were hoping that the legislative and judicial avenues would work, so they wanted to give that time.
Also, there are traitors, crooks, and spies to flush out.
And the ChiComs own a number of US governors...