I am on a mobile device so i will try my best...
Congress has no means to enforce their own subpoenas without the courts. Period.
You fail to understand the Congress has no need to enforce the subpoenas.
By refusing the subpoenas and instructing others to also refuse, Trump has obstructed Congress. Period.
He is simply guilty of 2nd Article of impeachment.
The best they can do on their own is hold someone in contempt, but even that has no consequences without referral to the courts. Their oversight duties do not grant them unfettered authority over another branch of government, and all conflicts between co-equal branches must be settled by the other. Nothing circular, except your repeated ignorance of the exact same points, over and over.
They have every right to recommend to the Senate by way of lodging articles of impeachment that the President be removed from office just for obstructing congress. They don't even need the article of abuse to make that recommendation.
I have no doubt that your comprehension of the matter does resemble "a confused ball of string".
There's no accounting for your utter ignorance of the US Constitution. What's bizarre is your apparent inability to simply do a Google search to educate yourself.
Yet it is you who keeps repeating no crime has been committed when in fact criminality is not the issue. There is no conviction, punishment or detention involved. The POTUS is immune to criminal charges. ( whilst in office)
His employment contract as POTUS is under review and he is being threatened with dismissal only. Sacking an employee who has failed in his duties is not a criminal issue. It is an administrative issue.
Once he is stood down and/or is no longer POTUS he can and probably will have to deal with any criminal charges brought against him.
I'm sure the Senate would let him testify, if he wanted to, but again, any lawyer would advise anyone to avoid the possibility of a perjury trap, which is why presidents will often only answer questions in writing.
In writing would be even better...but I would wager he probably will not even do that. His lawers will...
Defendants regular refuse to testify in their own defense, for many reasons. They may not be sympathetic in front of a jury, cross examination could rattle them or expose private info to public scrutiny, etc.. Happens all the time. So not only are you ignorant of the US Constitution, apparently you've also unaware of many court cases and never even watched many court dramas.
Who cares about that. If he behaved appropriately in the first place he wouldn't be facing dismissal.
Who said Congress wasn't obstructed? I've repeatedly said they obstructed themselves, by not suing to enforce their own subpoenas...and even withdrawing some subpoenas rather than risk going to court. I've said that there was no "obstruction of justice", a statutory crime. Obstruction/contempt of Congress is not a crime. Like Congressional subpoenas, the normal recourse for punishment in contempt/obstruction of Congress is, again, through the courts. Otherwise contempt/obstruction only results in censure, just a reprimand without any further consequences.
See above.
If your corporate financial controller proved to be incompetent and abused his office what would you tell the other share holders?
That they should appeal to the courts? Or would you just dismiss him and move on?
He has obstructed Congress... fact.
He has abused his office not only by obstructing Congress but by ordering others to obstruct Congresss also. Fact.
The with holding of aid to Ukraine to solicit personal favor has to be tested properly in a proper setting.
I doubt very much that the Senate will provide the proper setting... but we shall see... wont we?
Can you understand that if an empoyee is caught with his hands in till his employemt would be terminated before he goes to jail if convicted... you have administration and legal as separate isssues.
For Trump the criminal issues haven't even started to be brought.