The making of a myth

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...