The whistleblower and “informer” did not disappear, they are simply not as relevant since Congress moved on with testimony from fact witnesses who saw the corruption and impeachable offenses first hand. 

Here is more from The Hill:

In addition to Pelosi and Schiff, Trump also named “Sleepy Joe Biden, the Whistleblower (who miraculously disappeared after I released the transcript of the call), the 2nd Whistleblower (who also disappeared), & the I.G.”

(Psst, the “I.G.” is the Inspector General. I had to look it up too.)

Pelosi and Schiff, the chairman of the House Intelligence Committee, have been the main drivers of the impeachment inquiry, which will shift to public hearings this coming week.

Trump’s tweet echoes congressional Republicans’ criticism that the impeachment inquiry has been one-sided and unfair.

The president has also been vocal about the identity of the first whistleblower, saying that their identity should be released.

I’m reminded of that commercial with the old ladies. 

“That’s not the way this works, that’s not the way any of this works.”

I really don’t think that Trump has thought all of this through. 

For one thing, Pelosi and Schiff are not going to testify, because that would be stupid. 

But if they were willing I cannot believe that Trump would really want them to as they would serve as very compelling witnesses, who would easily outmaneuver his Republican henchmen on the committees. 

I think Donald Trump is fanaticizing about an outcome that is simply not based on reality. 

You know, like his entire presidency.