WaPo deep dive:

Key elements of the baseless claim that the 2020 election was stolen from President Donald Trump took shape in an airplane hangar here two years earlier, promoted by a Republican businessman who has sold everything from Tex-Mex food in London to a wellness technology that beams light into the human bloodstream.

At meetings beginning late in 2018, as Republicans were smarting from midterm losses in Texas and across the country, Russell J. Ramsland Jr. and his associates delivered alarming presentations on electronic voting to a procession of conservative lawmakers, activists and donors.

Briefings in the hangar had a clandestine air. Guests were asked to leave their cellphones outside before assembling in a windowless room. A member of Ramsland’s team purporting to be a “white-hat hacker” identified himself only by a code name…

The enduring myth that the 2020 election was rigged was not one claim by one person. It was many claims stacked one atop the other, repeated by a phalanx of Trump allies. This is the previously unreported origin story of a core set of those claims, ideas that were advanced not by renowned experts or by insiders who had knowledge of flawed voting systems but by Ramsland and fellow conservative activists as they pushed a fledgling company, Allied Security Operations Group, into a quixotic attempt to find evidence of widespread fraud where none existed.

To assemble a picture of the company’s role, The Washington Post obtained emails and company documents and interviewed 12people with direct knowledge of ASOG’s efforts, as well as former federal officials and aides from the Trump White House. Many spoke on the condition of anonymity to discuss private matters or out of fear of retribution. Three individuals who were present in the hangar for those 2018 meetings spoke about the gatherings publicly for the first time.