LONG WITNESS LIST, QUICK TIMELINE

Schiff’s committee has been negotiating to interview the whistleblower who began the firestorm by reporting to the inspector general for the intelligence community that Trump had urged the investigations on a July phone call with Zelenskiy.

Schiff told ABC’s “This Week” that his panel had reached agreement to hear from the whistleblower, who would testify “very soon.” Schiff said the exact date would depend in part on how quickly acting Director of National Intelligence Joseph Maguire completes the security clearance process for the whistleblower’s lawyers. “We’ll keep obviously riding shotgun to make sure the acting director doesn’t delay in that clearance process,” Schiff said.

The complaint from the whistleblower, whose identity is not publicly known, was released last week after Maguire withheld it from Congress for weeks. In the complaint, the whistleblower said White House officials moved to “lock down” the details of Trump’s call by putting all the records of it on a separate computer system.

The inspector general who handled that complaint, Michael Atkinson, is slated to testify to the Intelligence Committee in private on Friday, according to a person familiar with the committee who was spoke on condition of anonymity to discuss internal deliberations.

Lawmakers on the committee say they also want to speak to White House aides who were present for the call and to Rudy Giuliani, the president’s personal lawyer, who urged the investigations. Giuliani told ABC on Sunday that he “wouldn’t cooperate” with Schiff, but if Trump “decides that he wants me to testify, of course I’ll testify.” Schiff says he hasn’t decided whether he wants to hear from Giuliani.

Democrats say they hope to finish the investigation in a matter of weeks — perhaps even before Thanksgiving.