By NICK CORASANITI, ALAN FEUER, DUSTIN VOLZ and RICHARD FAUSSET NYTimes News Service The Federal Bureau of Investigation is assigning an army of 260 investigative analysts to a “priority” investigation related to the 2020 election in Fulton County, Georgia, a reflection of President Donald Trump’s ongoing push to prove his baseless claims that the 2020 election there was rigged.