Trump has already admitted to extortion and bribery on the July 25th call.
Mr Trump admitted to a "perfect" call, which any objective person should see as an example of what a smoking gun criminal collusion act is. Mr Trump may be the only person who did not understand what his call was. The NSC folks, recognized it and went into immediate coverup mode, WH attorneys recognized it and ordered the coverup, Amb Sondland knew Mr Trump was already engaged in a quid pro quo and had to confer with Mr Trump to verify Mr Trump did not think it was, all the US Ukrainian diplomats recognized Giuliani's efforts as criminal activities, should I go on .... it would appear everyone but Mr Trump recognized it for what it was ... a "perfect" example of abuse of power.
And this is precisely why Mr Mueller wanted to interview Mr Trump and all of Trump's attorneys did not want him to be deposed ... OMG ... he would have given up the gig before anyone could light a cigarette.
Does anyone recollect the courtroom scene from "A Few Good Men"? Here is my paraphrase
Rep Shiff: Did you order US aid to be held up until Ukraine begin an investigation into the Biden's?!
Mr Trump: YOU'RE GODDAMN RIGHT I DID!
Mr Trump: [Rep Shiff dismisses the committee] What is this? Mr Chairman, what's going on? I did my job, I'd do it again! [stands up defiantly] I'm gonna get on a plane and go on back to Mar a Lago
Mr Trump: What the hell is this?
AG Barr: Mr Trump, you have the right to remain silent. Any statement you make...
Mr Trump: [while AG Barr continues reading his rights] I'm being charged with a crime? Is that what this is? I'm being charged with a crime? This is funny. That's what this is. This is... [turns to Rep Shiff and lunges at him while Sgt at Arms hold him back] I'm gonna rip the eyes out of your head and piss into your dead skull! You [censored] with the wrong Trump!
And that would be the real narcissist Donald J Trump in action