What law forbids quid pro quo? How would such a demand be colluding with a foreign power? What law prohibits collusion?
When FDR sent old destroyers to the U.K. when the US was neutral and he demanded and received bases in the Caribbean in return why wasnt he impeached for quid pro quo?
You can’t accept a thing of value from a foreign power, much less extort it by illegally withholding aid. Trump did a bad, and Mulvaney said as much, and it’s described clearly in the July 25 call transcript. There’s no need to impeach the guy over it, but it’s not nothing.