he's actually living up to most of his campaign promises
https://thehill.com/policy/healthcare/471735-trump-draws-ire-after-retreat-on-drug-prices-pledge
Funny you bring that up. I read he's reneged on a promise to fight to negotiate drug prices in effort to curb the inflation of cost of drugs. That was a campaign promise that I was actually looking forward to. I guess you can't win them all, maybe he will reconsider come closer to the election but I think pharma has pressured him through leveraging republican senators. He's in a bad spot for many different reasons, he's entire administration is now beholden to RNC interest groups, the same ones that people wanted an outsider. Like I said before, in another thread, once I noticed how he lost the governorship of KY and Louisiana to democrats even after campaigning for the republican candidate (He held rallies three times and even cut a personal televised ad for Louisiana). This shows the RNC that Trump needs them much more then they need Trump. I've long since strayed off-topic so I'm going to wrap up.
Ok, I've entertained you long enough. We obviously will agree to disagree. You haven't presented anything of substance other than some weak right-wing talking points to excuse the alleged impeachable behavior that is being discussed in the inquiry. You certainly have failed on many counts to prove his assertion of executive privilege holds grounds despite precedent but if you firmly believe that executive privilege overrules congressional oversight even in a formalized impeachment inquiry, then you are entitled to that belief.
I stand by my arguments that historical precedent isn't on your side. And albeit unrelated a recent ruling of Trump's tax returns have raised all the way to the Supreme Court (each time against him in favor of congress). He's been losing in the courts in many areas. I anticipate he will fail just as Nixon and Clinton as the Courts held that the larger public interest in obtaining the truth took precedence.
By the way, Executive privilege isn't granted directly by the constitution, but by the supreme court in ruling of separation of powers, which is also where congress gets its oversight of the executive branch. I'd thought it was worth sharing.
"However, the Supreme Court of the United States has ruled that executive privilege and congressional oversight each are a consequence of the doctrine of the separation of powers, derived from the supremacy of each branch in its own area of Constitutional activity.[2]"