July 28: DNI Dan Coats exit announced
Aug. 8: Sue Gordon announces resignation
Aug. 12: Whistleblower files complaint
Thought it went unreported at the time, on Aug. 12, an anonymous member of the intelligence community filed a complaint with Intelligence Community Inspector General (ICIG) Michael Atkinson, flagging multiple instances of the president's conversations with a foreign leader the whistleblower said were troubling. Of note was an undisclosed "promise" Trump reportedly made to that foreign leader during one or more conversations.
Aug. 15: Coats, Gordon exit, Maguire steps in as acting DNI
Aug. 26: Whistleblower complaint is forwarded to Maguire
By law, Atkinson was given 14 days to review the whistleblower complaint and make a determination on whether it was credible and of "urgent concern." Apparently finding both to be true, Atkinson forwarded the complaint to Maguire, who had one week to deliver a report on the whistleblower claim to Congress.
Sept. 2: Maguire misses congressional deadline
Sept. 2 passed, and Maguire declined to issue a report on the whistleblower claim to members of the House and Senate Intelligence committees, which Democrats have since said was a violation of the law.
Sept. 9: Atkinson alerts Congress
Taking matters into his own hands, the inspector general
penned a note to lawmakers including Rep.
Adam Schiff (D-Calif.), chairman of the House Intelligence Committee, alerting them to the existence of the whistleblower complaint and accusing Maguire of failing to issue a report to Congress.
Sept. 10: Schiff writes back, demands complaint
Schiff wrote to Maguire the next day, accusing the acting DNI of breaking the law by failing to issue the report on the whistleblower's complaint to Congress. In his letter, Schiff demanded more information about the contents of the complaint.
Sept. 13: DNI responds
In a letter several days later to Schiff, Atkinson's general counsel Jason Klitenic
explained that the matter was judged to not be of "urgent concern" after consultation with the Justice Department.
Schiff
subpoenaed Maguire to provide his committee with the whistleblower complaint, writing
in his own letter to Maguire that "you have neither the legal authority nor the discretion to overrule a determination by the IC IG."