“Quid pro quo” just means “this for that.”
It is just an exchange of value.
It is not necessarily illegal. “Quid pro quo” is only illegal if the “quid” or the “quo” is illegal. If both the “quid” and the “quo” are legal — a legal exchange, such as a trade deal — no problem. But if either the “quid” or the “quo” are ILLEGAL, big problem.
There are many official acts that involve a “quid pro quo” that are perfectly legal, such as trade deals and even putting pressure on foreign governments to help with matters of official U.S. policy, but NOT solicitation of actions that are in clear violation of U.S. law for personal political advantage, such as BRIBERY, SOLICITATION of illegal foreign political aid or EXTORTION.
So what we really need to address is the ILLEGAL part. In this case, BRIBERY, one of the two crimes explicitly stated in Article II Section 4 of the Constitution, along with treason and then the more vague, generalized mention of unspecified “high crimes and misdemeanors,” which is anything the Congress says it is and the Senate will agree merits conviction.
Clearly, the more specific term we should use is BRIBERY, which includes the solicitation of something of value in exchange for performance of official duties, whether or not the thing of value is delivered.