Not a whistle blower but a CIA faction

WASHINGTON (AP) — House Intelligence Committee Chairman Adam Schiff said Sunday that he expects the whistleblower at the heart of impeachment proceedings against President Donald Trump to testify “very soon.”
“All that needs to be done, at this point, is to make sure that the attorneys that represent the whistleblower get the clearances that they need to be able to accompany the whistleblower to testimony,” said Schiff, D-Calif., “and that we figure out the logistics to make sure that we protect the identity of the whistleblower.”
As Democrats and the director of national intelligence worked out key arrangements, Trump’s allies erupted in a surge of second-guessing and conspiracy theorizing across the Sunday talk shows, suggesting the White House strategy is unclear against the stiffest challenge to his presidency. One former adviser urged Trump to confront the crisis at hand and get past his fury over the probe of Russian election interference.

There is a split in the CIA, but a significant circumstantial case that a group of agents are presenting this report.   No need to cite Whistle Blower law. It is sufficient that a CIA faction present the evidence. It is still a House procedure unto itself.