President Donald Trump Picture: Evan Vucci/AP

Washington – The whistleblower’s identity remains obscured, the details of his work for the CIA cloaked in secrecy. But the document he delivered reveals almost as much about the investigative mission he carried out in stealth as it does about the alleged abuses of power by the president.

From the moment he learned about President Donald Trump’s attempts to extract political dirt on former vice president Joe Biden from the newly elected leader of Ukraine on July 25, the CIA officer behind the whistleblower report moved swiftly behind the scenes to assemble material from at least a half-dozen highly placed – and equally dismayed – U.S. officials.

He wove their accounts with other painstakingly gathered material on everything from the intervention of Trump’s personal lawyer Rudy Giuliani in the U.S.-Ukraine relationship to alleged efforts by American diplomats sent to Kiev and attorneys in the Office of the White House Counsel to contain or suppress the accruing damage.

On August 12, he delivered his document – a nine-page version of which was made public on Thursday – to the intelligence community’s inspector general, triggering an almost immediate clash between the executive branch and Congress.

Six weeks later, the whistleblower has by some measures managed to exceed what former special counsel Robert Mueller III accomplished in two years of investigating Trump: producing a file so concerning and factually sound that it has almost single-handedly set in motion the gears of impeachment.