Mulvaney has privately admitted freezing of military aid was meant to press Ukraine to investigate corruption.
I looked at the timeline. Mulvaney surely knew this really meant, "target Biden.' Quid, meet quo:
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Giuliani talked extensively about thi to NYT, and tweeted about it. Trump aired it on Fox News.
Mick Mulvaney knew all this when he froze military aid:
washingtonpost.com/opinions/2019/…
washingtonpost.com/opinions/2019/…