When the "quid pro quo" is withholding essential military money from an ally that is desperately trying to hold off Russian aggression unless they satisfy his need to find dirt on an opponent, it is darn well impeachable. So yes, quid pro quo IS impeachable, along with multiple other abuses of power. Note to Republicans: Borrow Diageneses' lantern and find an honest man among you to run for president. Or maybe a spotlight? It's embarrassing that the party has come to this.